Classifying Quadrilaterals and Triangles

Front

What is a triangle with all three angles less than 90 degrees called?

Back

An acute triangle.

Front

How many sides does a quadrilateral have?

Back

4 sides.

Front

What is the only property of a trapezoid?

Back

One pair of opposite sides is parallel.

Front

What type of triangle has one angle greater than 90 degrees?

Back

An obtuse triangle.

Front

What do you call a triangle with two equal sides?

Back

An isosceles triangle.

Front

What is a triangle with all sides of equal length called?

Back

An equilateral triangle.

Front

What is a quadrilateral with opposite sides that are equal and parallel?

Back

A parallelogram.

Front

How many acute angles must an acute triangle have?

Back

3 acute angles.

Front

What type of triangle has no equal sides?

Back

A scalene triangle.

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees.