Open Up Geometry

Name the shape shown in the picture

• Irregular Octogon

• Regular Quadrilateral

• Regular Pentagon

• Irregular Triangle

Name the following shape

• Isosceles Obtuse Triangle

• Isosceles Acute Triangle

• Equilateral Acute Triangle

• Scalene Obtuse Triangle

Name the following shape

• Right Isosceles Triangle

• Obtuse Scalene Triangle

• Irregular Triangle

• Right Scalene Triangle

Name the following shape

• Obtuse Equilateral Triangle

• Acute Scalene Triangle

• Obtuse Scalene Triangle

• Right Equilateral Triangle

Name the following shape

• Regular Hexagon

• Regular Pentagon

• Irregular Triangle

• Regular Octogon

An Acute triangle 

• has one acute angle

• has 3 acute angles

• has two obtuse angles and one acute

What type of angle is this?

• reflex angle

• right angle

• acute angle

• obtuse angle

What kind of angle is this?

• acute angle (less than a right angle)

• right angle

• obtuse angle (greater than a right angle)

This is a pentagon. Pentagons have...

• 5 sides and 5 angles

• 3 sides and 2 angles

• 2 sides and 3 angles

• 10 sides all together

What are these lines called?

• Parallel

• Perpendicular

• Intersecting