Math 2: CW 5.2 Isosceles 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 the vertex angle in an isosceles triangle?

Back

The vertex angle is the angle opposite the base of the isosceles triangle.

Front

If the two equal sides of an isosceles triangle are each 10 cm, what is the minimum length of the base?

Back

The minimum length of the base must be greater than 0 cm and less than 20 cm.

Front

In an isosceles triangle, if the base angles are each 45 degrees, what is the vertex angle?

Back

The vertex angle is 90 degrees.

Front

How do you find the height of an isosceles triangle?

Back

The height can be found by drawing a perpendicular line from the vertex to the base, creating two right triangles.

Front

What is the relationship between the 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 base angles?

Back

Each base angle is 70 degrees.

Front

What is the formula for the area of an isosceles triangle?

Back

Area = 1/2 * base * height.

Front

If the base of an isosceles triangle is 12 cm and the height is 5 cm, what is the area?

Back

Area = 1/2 * 12 * 5 = 30 cm².

Front

What is the sum of the interior angles of any triangle?

Back

The sum of the interior angles of any triangle is 180 degrees.