Triangles and Angles Practice

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry.

Front

What are the types of triangles based on sides?

Back

1. Scalene: All sides are different lengths. 2. Isosceles: Two sides are of equal length. 3. Equilateral: All three sides are of equal length.

Front

What are the types of triangles based on angles?

Back

1. Acute Triangle: All angles are less than 90°. 2. Right Triangle: One angle is exactly 90°. 3. Obtuse Triangle: One angle is greater than 90°.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90°.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Front

How do you find the measure of a missing angle in a triangle?

Back

The sum of the angles in a triangle is always 180°. To find a missing angle, subtract the sum of the known angles from 180°.

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

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

How many acute angles must an acute triangle have?

Back

An acute triangle must have three acute angles.