Isosceles & Equilateral Practice

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

In an isosceles triangle, how do you find the measure of the vertex angle if the base angles are known?

Back

The vertex angle can be found using the formula: Vertex Angle = 180° - 2(Base Angle).

Front

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

Back

In an equilateral triangle, all sides are equal, and all angles are equal to 60 degrees.

Front

How do you find the length of the base of an isosceles triangle if the height and the equal sides are known?

Back

Use the Pythagorean theorem: Base/2 = √(Equal Side² - Height²).

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

If the lengths of the sides of a triangle are 5, 5, and 8, what type of triangle is it?

Back

It is an isosceles triangle.

Front

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

Back

Each angle measures 60 degrees.