Isosceles & Equilateral Triangles

Front

What do the angles in an equilateral triangle measure?

Back

60°, 60°, 60°

Front

What is the equation you would use to find x in an isosceles triangle with angles 4x + 1, 4x + 1, and 5x - 4?

Back

4x + 1 + 4x + 1 + 5x - 4 = 180

Front

Find x if the angles of an isosceles triangle are 4x + 1, 4x + 1, and 5x - 4.

Back

16

Front

What is the length of DF in an isosceles triangle where the two equal sides are 8?

Back

8

Front

What is the measure of ∠A in an isosceles triangle if the other angles are 46° and 46°?

Back

88°

Front

Define an isosceles triangle.

Back

A triangle with at least two sides of equal length.

Front

Define an equilateral triangle.

Back

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

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

Isosceles triangle.

Front

What is the relationship between the sides and angles in an equilateral triangle?

Back

All sides are equal, and all angles are equal to 60°.