Triangles and Quadrilaterals

Front

What is a triangle?

Back

A triangle is a three-sided polygon.

Front

What are the types of triangles based on side lengths?

Back

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

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides of equal length and all angles measuring 60 degrees.

Front

What is an isosceles triangle?

Back

An isosceles triangle has two sides of equal length and the angles opposite those sides are equal.

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths and all angles of different measures.

Front

What is a right triangle?

Back

A right triangle has one angle that measures 90 degrees.

Front

What is a quadrilateral?

Back

A quadrilateral is a four-sided polygon.

Front

What are the types of quadrilaterals?

Back

1. Square: All sides equal, all angles 90 degrees. 2. Rectangle: Opposite sides equal, all angles 90 degrees. 3. Rhombus: All sides equal, opposite angles equal. 4. Trapezoid: At least one pair of parallel sides.

Front

How many degrees are in a triangle?

Back

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

Front

What is a right angle?

Back

A right angle measures exactly 90 degrees.