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...

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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.

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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...

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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.

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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...

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A scalene triangle has no equal sides. There is no word for a triangle with three different angle sizes. The words describing angle sizes — right, obtuse and acute — reference the degrees of the angle, not their relation...

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The SSS congruence postulate states that if all three sides of one triangle are congruent to the corresponding sides of another triangle, the triangles themselves are congruent. Triangles are congruent if, when one is su...

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