Lines and Angles in Shapes

An angle that forms a square corner is called 

• a right angle
• an acute angle
• an obtuse angle
• a straight angle

• parallel lines
• perpendicular lines
• intersecting lines
• a ray

• parallel lines

• perpendicular lines

• a parallelogram

• a ray

• parallel lines
• perpendicular lines
• intersecting lines
• a ray

Name the following triangle by its angles.

• scalene triangle

• right triangle

• obtuse triangle

• acute triangle

Does this shape have a right angle?

• Yes

• No

The shapes above were sorted into two groups. Which of the following are two possible titles for those groups?

• Shapes with Right Angles, Shapes with No Angles

• Shapes with All Equal Sides, Shapes with Right Angles

• Shapes with Right Angles, Shapes with Parallel Sides

• Shapes with All Equal Sides, Shapes with Obtuse Angles

Which statement is true for all rectangles?

• All of the sides are congruent.
• They have exactly four sides.
• They have exactly six vertices.
• All the angles are acute.

Which type of angle is pictured?

• Acute
• Right
• Obtuse
• Straight

Choose the Right Triangle

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