Properties of Triangles

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What is the Triangle Inequality Theorem?

Back

The Triangle Inequality Theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Front

How do you classify a triangle based on its angles?

Back

Triangles can be classified as acute (all angles < 90°), right (one angle = 90°), or obtuse (one angle > 90°).

Front

How do you classify a triangle based on its sides?

Back

Triangles can be classified as equilateral (all sides equal), isosceles (two sides equal), or scalene (all sides different).

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 degrees.

Front

If two angles are supplementary and one angle measures 80°, what is the measure of the other angle?

Back

The other angle measures 100° (180° - 80° = 100°).

Front

Can a triangle have side lengths of 5, 10, and 15?

Back

No, because 5 + 10 is not greater than 15.

Front

What is the formula to find the area of a triangle?

Back

The area of a triangle can be found using the formula: Area = 1/2 * base * height.

Front

If a triangle has angles measuring 60°, 60°, and 60°, what type of triangle is it?

Back

It is an equilateral triangle.