TRIANGLES

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

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 are the types of triangles based on sides?

Back

1. Equilateral triangle: All sides are equal. 2. Isosceles triangle: Two sides are equal. 3. Scalene triangle: All sides are different.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

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

What is a line of symmetry?

Back

A line of symmetry is a line that divides a shape into two identical halves.

Front

Can a triangle have more than one right angle?

Back

No, a triangle cannot have more than one right angle.

Front

What is a perpendicular line?

Back

Perpendicular lines are lines that intersect at a right angle (90°).