Equilateral & Isosceles Triangles

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length and all three angles measuring 60°.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length and the angles opposite those sides are equal.

Front

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

Back

180°.

Front

If two angles of a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the vertex angle in an isosceles triangle?

Back

The angle opposite the base, which is formed by the two equal sides.

Front

If the base angles of an isosceles triangle are 40°, what is the vertex angle?

Back

100°.

Front

How do you classify a triangle with one angle greater than 90°?

Back

It is classified as an obtuse triangle.

Front

What is the relationship between the sides and angles in a triangle?

Back

The larger the angle, the longer the opposite side.

Front

What is the formula to find the height of an equilateral triangle?

Back

Height = (√3/2) * side length.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths and all angles of different measures.