Grade 4 Theme 2 Mid-Unit Review

What type of angle is shown in the pictures?

• A reflex angle

• A straight angle

• A right angle

• An acute angle

• An obtuse angle

Answer explanation

A right angle is created at the intersection of 2 perpendicular lines. Shapes such as squares and rectangles have right angles.

What type of angle is shown in the pictures?

• A reflex angle

• A straight angle

• A right angle

• An acute angle

• An obtuse angle

Answer explanation

An ACUTE ANGLE is an angle that is less than a right angle. Do you see where the acute angle is created in this work of art?

What type of angle is shown in the pictures?

• A reflex angle

• A straight angle

• A right angle

• An acute angle

• An obtuse angle

Answer explanation

An OBTUSE ANGLE is an angle that is greater than a right angle. Do you see where the obtuse angles are created in this optical illusion?

What type of lines are shown in the picture?

• intersecting lines

• perpendicular lines

• parallel lines

Answer explanation

PERPENDICULAR lines are those that cross at a right angle. Which math symbol shows perpendicular lines?

What type of lines are shown in the picture?

• intersecting lines

• perpendicular lines

• parallel lines

Answer explanation

PARALLEL lines are lines that will never meet, even if they are extended. Which math symbol uses parallel lines?

Which math symbol is used to show parallel lines?

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Which math symbol is used to show perpendicular lines?

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• Geometry Street  Science Avenue

• History Lane

  1st Street

• Paragraph Street

  Main Street

• Geography Way

  Music Avenue

• Geometry Street  Science Avenue

• History Lane

  1st Street

• Paragraph Street

  Main Street

• Geography Way

  Music Avenue

Which angle in this pentagon is an obtuse angle?