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 sides opposite those angles?

Back

The sides opposite the equal angles are also equal in length.

Front

In an equilateral triangle, what is the measure of each angle?

Back

Each angle in an equilateral triangle measures 60 degrees.

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

If the perimeter of an equilateral triangle is 21 meters, what is the length of each side?

Back

Each side is 7 meters long.

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the angles opposite the equal sides are also equal.

Front

If the lengths of the two equal sides of an isosceles triangle are 10 cm, what is the minimum length of the base?

Back

The minimum length of the base must be less than 20 cm.

Front

What is the formula for the area of a triangle?

Back

The area of a triangle can be calculated using the formula: Area = 1/2 * base * height.