A triangle with two equal sides is called an isosceles triangle. The angles opposite the equal sides in an isosceles triangle are also equal. The third, unequal side of an isosceles triangle is called the base of the tri...

www.reference.com/article/triangle-two-equal-sides-c26cdd6b2b5b993e

A rectangle has four right angles and two pairs of equal sides. Rectangles are four-sided polygons known as quadrilaterals. Other types of quadrilaterals are the square, rhombus, trapezoid, parallelogram and kite.

www.reference.com/article/shape-four-right-angles-two-pairs-equal-sides-a23d42aa265b1b9a

An isosceles triangle has two side lengths that are equal and a remaining side that is of a different length. The two interior angles that are opposite these sides are equal to each other. The unequal side length of an i...

www.reference.com/world-view/side-lengths-isosceles-triangle-5b7707d55e31524c

A polygon with three sides is called a triangle. All triangles consist of three lines that are not collinear and three angles. Polygons can have any number of sides, but they must be closed figures.

www.reference.com/article/three-sided-polygon-called-cfd1b251ec5cec9c

Three laws can be used to find the sides and angles of almost any triangle: the Law of Angles, the Law of Sines, and the Law of Cosines. The Law of Angles means that all three angles of a triangle add up to 180 degrees. ...

www.reference.com/article/use-formula-angles-triangle-f0bebcc32adc7693

You can locate the orthocenter of a triangle by drawing the altitudes of each of the triangle's sides and pinpointing the point at which all three lines intersect. The triangle must be an acute triangle for it to have it...

www.reference.com/article/orthocenter-triangle-ce4de7d1821ee702

The perimeter of a triangle is the sum of all the sides of the triangle, and you determine the perimeter of any triangle by adding the lengths of all three sides. Since an isosceles triangle has two sides of equal length...

www.reference.com/article/solve-perimeter-isosceles-triangle-1fb40fe7e0989dcb