Isosceles and Equilateral Triangles

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

What are the equal sides of an isosceles triangle called?

Back

The equal sides of an isosceles triangle are called the legs.

Front

What is the vertex angle in an isosceles triangle?

Back

The vertex angle is the angle opposite the base of the isosceles triangle.

Front

How do you calculate the vertex angle if the base angles are known?

Back

The vertex angle can be calculated using the formula: Vertex Angle = 180° - 2 * Base Angle.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle in which all three sides are of equal length and all three angles are equal to 60 degrees.

Front

What is an equiangular triangle?

Back

An equiangular triangle is a triangle where all three angles are equal, which also makes it equilateral.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

What type of triangle has all angles less than 90 degrees?

Back

An acute triangle has all angles less than 90 degrees.

Front

What type of triangle has one angle greater than 90 degrees?

Back

An obtuse triangle has one angle greater than 90 degrees.

Front

What is the classification of a triangle with two equal sides and one angle greater than 90 degrees?

Back

It is classified as an obtuse isosceles triangle.