Identifying Polygons

A closed figure with three or more straight sides.

Examples: triangle, quadrilateral, pentagon, hexagon​ (a)  

• polygon
• edge
• vertices
• quadrilateral
• parallel
• base

Which of these figures are considered polygons?

Which of the following is not a polygon?

• Parallelogram

• Triangle

• Rectangle

• Shape with a curved edge

Which polygon has exactly 2 sets of parallel lines?

• A

• B

• C

• D

Match the following polygons with their names.

• A polygon with 3 sides

• a pentagon

• A polygon with 4 sides

• a quadrilateral

• A polygon with 8 sides

• a triangle

• A polygon with 5 sides

• an octagon

Answer explanation

An octagon is a polygon with eight sides. The other options are incorrect as a pentagon has five sides, a quadrilateral has four sides, and a triangle has three sides. Therefore, the correct answer is an octagon.

Which choice shows a set of perpendicular lines?

• A

• B

• C

• D

Which two line segments are parallel?

• A and B

• A and E

• B and C

• E and C

Which two line segments are perpendicular?

• CD and DE

• AB and BC

• EF and FG

• GH and HI

Name two quadrilaterals that have obtuse and acute angles.

• Kite, Square

• Square, Rectangle

• Rhombus, Trapezoid

• Rectangle, Trapezoid

What is angle A?

• obtuse

• right

• left

• acute