SSG 4.3 Isosceles and Equilateral Triangles

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is an equilateral triangle?

Back

A triangle where all three sides are of equal length and all three angles are equal to 60 degrees.

Front

What is the vertex angle in an isosceles triangle?

Back

The angle opposite the base, which is formed by the two equal sides.

Front

In an isosceles triangle, how do you find the base angles?

Back

The base angles are equal and can be found using the formula: (180 - vertex angle) / 2.

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is always 180 degrees.

Front

If one angle of an equilateral triangle is 60 degrees, what are the other two angles?

Back

Both angles are also 60 degrees.

Front

How do you determine the measure of an unknown angle in an isosceles triangle?

Back

Use the formula: x + x + vertex angle = 180 degrees.

Front

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

Back

The angles opposite the equal sides are equal.

Front

If the vertex angle of an isosceles triangle is 40 degrees, what are the measures of the base angles?

Back

Each base angle measures 70 degrees.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.