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 measure 60°.

Front

What is the property of angles in an isosceles triangle?

Back

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

Front

How do you find the vertex angle of an isosceles triangle?

Back

To find the vertex angle, subtract the sum of the base angles from 180°.

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 angle of an isosceles triangle measures 40°, what are the measures of the other two angles?

Back

The other two angles each measure 70°.

Front

What is the relationship between the sides and angles of a triangle?

Back

In a triangle, the larger the side, the larger the opposite angle.

Front

How do you determine if a triangle is equilateral?

Back

A triangle is equilateral if all three sides are equal in length.

Front

What is the formula for the area of a triangle?

Back

The area of a triangle is given by the formula: Area = 1/2 * base * height.

Front

What is the base of an isosceles triangle?

Back

The base of an isosceles triangle is the side that is not equal to the other two sides.