Flashcard 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. The angles opposite these sides are also equal.

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°.

Front

If one base angle of an isosceles triangle measures 40°, what is the measure of the vertex angle?

Back

The vertex angle measures 100°.

Front

In an isosceles triangle, if the base angles are equal, how can you find the vertex angle?

Back

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, each measuring 60°.

Front

How do you find the measure of an angle in an isosceles triangle if you know the base angles?

Back

Front

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

Back

In an equilateral triangle, all angles are equal and each measures 60°.

Front

If angle J measures 68° and angle K measures 44°, what is the measure of the third angle in the triangle?

Back

Front

What is the formula for the area of a triangle?

Back

Front

If the base of an isosceles triangle is 10 cm and the height is 8 cm, what is the area?

Back