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 property of angles in an isosceles triangle?

Back

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

Front

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

Back

The minimum possible length of the base is greater than 0 cm, but less than 20 cm.

Front

How do you find the height of an isosceles triangle?

Back

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

Front

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

Back

Area = (base * height) / 2.

Front

If the base of an isosceles triangle is 8 cm and the height is 5 cm, what is the area?

Back

Area = (8 * 5) / 2 = 20 cm².

Front

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

Back

The sum of the angles in any triangle is 180 degrees; in an isosceles triangle, the two equal angles plus the base angle equal 180 degrees.

Front

Classify the triangle with angles measuring 70°, 70°, and 40°.

Back

It is an acute isosceles triangle.

Front

What is the base angle in an isosceles triangle if the vertex angle is 40°?

Back

The base angles are each 70°.

Front

If one angle of an isosceles triangle is 100°, what are the other two angles?

Back

Each of the other two angles is 40°.