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 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 the sum of the interior angles of a triangle?

Back

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

Front

If two angles of a triangle are equal, what can be said about the triangle?

Back

The triangle is isosceles.

Front

How do you find the perimeter of an equilateral triangle?

Back

The perimeter of an equilateral triangle can be found by multiplying the length of one side by 3.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

If the length of one side of an equilateral triangle is 24, what is its perimeter?

Back

The perimeter is 72 (24 x 3).

Front

In an isosceles triangle, if the equal sides are 10 units each, what is the minimum length of the base?

Back

The minimum length of the base must be greater than 0 and less than 20 units.

Front

What is the relationship between the angles opposite the equal sides of an isosceles triangle?

Back

The angles opposite the equal sides are also equal.

Front

If the base angles of an isosceles triangle are 45 degrees, what is the measure of the vertex angle?

Back

The vertex angle measures 90 degrees.