Thanksgiving Flashcard

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

If an isosceles triangle has a base angle measuring 40°, what is the measure of the vertex angle?

Back

100°

Front

What are the measures of the angles in an equilateral triangle?

Back

60°, 60°, 60°

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

What is the definition of a base in a triangle?

Back

The base of a triangle is any one of its sides, often referred to as the side on which the triangle is considered to be standing.

Front

In an isosceles triangle, if the base angles 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

What is the formula to find the vertex angle of an isosceles triangle given the base angle?

Back

Vertex angle = 180° - 2 * (base angle).

Front

What is the relationship between the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

If one angle of a triangle measures 72°, what is the measure of the other two angles if it is an isosceles triangle?

Back

72°, 72° (the other two angles are equal).

Front

What is the definition of 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°.