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 the angles in an isosceles triangle?

Back

The angles opposite the equal sides are also equal.

Front

If the two equal sides of an isosceles triangle are each 5 cm, what is the minimum possible length of the base?

Back

The minimum possible length of the base is greater than 0 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 vertex opposite the base to the midpoint of the base.

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 10 cm and the height is 6 cm, what is the area?

Back

Area = (10 * 6) / 2 = 30 cm².

Front

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

Back

The larger the angle, the longer the opposite side.

Front

If one angle of an isosceles triangle is 40 degrees, what are the other two angles?

Back

The other two angles are each 70 degrees.

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.

Front

How can you determine if a triangle is isosceles using side lengths?

Back

If two sides are equal in length, the triangle is isosceles.