# Trigonometry

Q:

## What is the definition of "plane trigonometry"?

A:

"Plane trigonometry" is a branch of mathematics that focuses on the relationship between the sides and angles of a triangle. Plane trigonometry builds upon the basic concepts of Euclidean geometry, and it has applications in a variety of mathematical fields, from physics to advanced calculus.

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• #### Q:Does an isosceles triangle have rotational symmetry?

A: An isosceles triangle could have rotational symmetry if it were also an equilateral triangle. An isosceles triangle is a triangle with at least two equal sides. An equilateral triangle is a triangle with exactly three equal sides. By definition, all equilateral triangles are also isosceles triangles.
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• #### Q:What is the definition of "plane trigonometry"?

A: "Plane trigonometry" is a branch of mathematics that focuses on the relationship between the sides and angles of a triangle. Plane trigonometry builds upon the basic concepts of Euclidean geometry, and it has applications in a variety of mathematical fields, from physics to advanced calculus.
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• #### Q:What are the branches of trigonometry?

A: The two main branches of trigonometry are plane trigonometry and spherical geometry. Trigonometry in general deals with the study of the relationships involving the lengths of angles and triangles.
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• #### Q:Who are the mathematicians who contributed to trigonometry?

A: Trigonometry developed in many parts of the world over thousands of years, but the mathematicians who are most credited with its discovery are Hipparchus, Menelaus and Ptolemy. Isaac Newton and Euler contributed developments to bring trigonometry into the modern age.
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• #### Q:How do I calculate the incline of a treadmill?

A: The incline of a treadmill in degrees is not the same as the gradient, which is given in percentage, and some treadmills do not display either figure. Calculate the incline of your treadmill on your own with a measuring tape and a calculator.
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• #### Q:What is a line through a circle called?

A: The line that intersects a circle can be called a diameter, a secant or a chord. The proper term depends on the line's properties and where the line intersects the circle.
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• #### Q:How is trigonometry used in aviation?

A: Trigonometry is used in aviation extensively, both in the calculations performed by the machines and computers used by the pilots, and by pilots performing quick rudimentary calculations and estimates themselves. Trigonometry and trigonometric functions are used to estimate distances and landing patterns and navigate around obstacles.
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• #### Q:How do you draw a parabolic curve?

A: According to the University of California, San Diego (UCSD), a parabolic curve, or "parabola," is the graphical representation of a quadratic equation. To draw one, the points of a function are plotted on an x-y coordinate grid and the plotted points are connected in succession. The solution should look similar to the bottom half of a circle.
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• #### Q:What are complementary angles in real life?

A: When it is three o’clock, the two hands of the clock are on digits 12 and 3. The seconds hand moves between these two digits and forms a pair of complementary angles in real life. The sum of the two angles formed by the seconds hand is always 90 degrees.
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• #### Q:How do you solve a power reduction formula?

A: To solve a power-reduction formula, express it in a simplified way without exponents. For example, solve "sine to the 4th power times x" by squaring "sine squared times x." From there, further simplify by multiplying "1 minus the cosine of 2x divided by 2."
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• #### Q:How do you integrate the function "sin" using the half angle formula?

A: The half-angle formula is used to integrate the function sine when it is taken to a power, such as sine squared and sine to the power of 6. The half-angle formula is used to eliminate exponents from the integral, stating that sin2(x) = 1/2 - (1/2) * cos(2x).
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• #### Q:What is the way to evaluate sin(arc-tan x)?

A: Evaluating sin(arc-tan x) is a simple process that involves two steps: using a right-angled triangle to label the two sides and the angle in question, which is x, and using the Pythagoras theorem to calculate the remaining side and calculating the function from these values. Writing out the expression in words is the starting point of evaluating it. In this case, it is the sine of Arc-tan x.
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• #### Q:What is sin 90 degrees?

A: Sin 90 degrees is equal to one. This degree value can also be expressed in radians as sin(?/2) = 1. This value of the sine function corresponds to one-fourth of the complete arc distance along the unit circle.
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• #### Q:What is the integral of sin^2?

A: The integral of sin^2 is one-half of x, minus one-eighth of the sine of 4x, plus a constant. Using mathematical notation, the integral of sine squared can be written as sin^2 x dx = 1/2 * x - 1/8 * sin(4x) + C.
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• #### Q:What is arctan of infinity?

A: The principal value of arctan(infinity) is pi/2. Arctan is defined as the inverse tangent function on the range (-pi/2, pi/2). This means that x = arctan(y) is the solution to the equation y = tan(x), where x is defined as being between -pi/2 and pi/2.
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• #### Q:What is a feasible region?

A: A feasible region is an area defined by a set of coordinates that satisfy a system of inequalities. The region satisfies all restrictions imposed by a linear programming scenario. The concept is an optimization technique. For example, a planner can use linear programming to determine the best value obtainable under conditions dictated by several linear equations that relate to a real-life problem.
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• #### Q:When was trigonometry invented?

A: Ancient Egyptian and Greek philosophers used an early form of trigonometry that involved calculating chords to obtain the angles of a triangle. This method was effective for Euclidean plane geometry, but the heart of trigonometry, the sine, was developed in India in the sixth century.
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• #### Q:How do you find the cosine of pi?

A: The trigonometric functions sine, cosine and tangent calculate the ratio of two sides in a right triangle when given an angle in that triangle. To find the cosine of angle pi, you need graph paper.
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• #### Q:How do you graph a hyperbola?

A: To graph a hyperbola, find and mark the center, calculate the conjugate and transverse axes, and draw the rectangle that helps you give your hyperbola the correct shape before drawing in the curves. Once graphed, a hyperbola looks like a pair of parabolas with the vertices facing each other.
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• #### Q:How do architects use trigonometry?

A: Architects use trigonometry to calculate roof slopes, light angles, ground surfaces, structural loads and heights of structures, according to Edurite. Architects are responsible for translating designer's plans into scale-model mathematical representations that contractors use to construct a building physically. Architects draw angles, determine heights and calculate measurements using trigonometric functions.
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• #### Q:What is an application of trigonometry?

A: One application of trigonometry in the real world is determining the distance and location of faraway objects. This is useful in navigation and in surveying. Historically, trigonometry was also applied to determine the position of heavenly bodies, but this use has been supplanted by linear algebra in modern times.
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