Isosceles & Equilateral Triangles Practice

Front

What is an isosceles triangle?

Back

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

Front

What is an equilateral triangle?

Back

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

Front

If two sides of a triangle are congruent, then the __________ opposite those sides are congruent.

Back

angles

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is always 180 degrees.

Front

In an isosceles triangle, what can you say about the angles opposite the equal sides?

Back

The angles opposite the equal sides are also equal.

Front

What is the formula to find the area of a triangle?

Back

Area = 1/2 * base * height.

Front

If one angle of an isosceles triangle is 30 degrees, what are the other two angles?

Back

The other two angles are each 75 degrees.

Front

What do we call the longest side of a right triangle?

Back

The hypotenuse.

Front

How do you find the length of a side in a right triangle using the Pythagorean theorem?

Back

a² + b² = c², where c is the hypotenuse.

Front

What is a vertex in a triangle?

Back

A vertex is a point where two sides of a triangle meet.