4-7 Isosceles (PRE)

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

The angles opposite the equal sides are also equal.

Front

If two angles of a triangle are equal, what can be said about the sides opposite those angles?

Back

The sides opposite the equal angles are also equal.

Front

How do you find the third angle in a triangle if you know the other two angles?

Back

The third angle can be found using the formula: Third Angle = 180° - (Angle1 + Angle2).

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 the base angles of an isosceles triangle are 38°, what is the vertex angle?

Back

The vertex angle can be found using: Vertex Angle = 180° - 2 * Base Angle = 180° - 76° = 104°.

Front

In an isosceles triangle, if one angle is 94°, what are the other two angles?

Back

The other two angles are equal and can be found using: 180° - 94° = 86°, so each of the other angles is 43°.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

If the height of an isosceles triangle is 10 units and the base is 8 units, what is the area?

Back

Area = 1/2 * 8 * 10 = 40 square units.

Front

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

Back

In a triangle, larger angles are opposite longer sides, and smaller angles are opposite shorter sides.