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Understanding Angles and Types

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Understanding Angles and Types

Help plan a mini-golf course by spotting and drawing angles. An angle is made by two arms that meet at a vertex. Acute angles are less than 90°, right angles are exactly 90°, obtuse angles are greater than 90° but less than 180°, and a straight angle is 180°.

Spot the angle

Use the angle sketches below to answer Questions 1–3. The small square marks a right angle; the other angles are drawn approximately.

A

B

C

1.Which sketch shows an acute angle?
  • A
  • B
  • C
2.Which sketch shows a right angle, and how many degrees is it?
3.Sketch C is greater than 90° and less than 180°. What type of angle is it?
  • Acute
  • Right
  • Obtuse
  • Straight

Angles on the course

A mini-golf designer marks angles where paths turn. Use the clues to identify each turn.

4.A path turns through 35°. Is the turn acute, right, obtuse or straight?
5.A ramp makes an angle of 120° with the ground. Is this angle acute, right, obtuse or straight?
  • Acute
  • Right
  • Obtuse
  • Straight
6.Fill in the missing words: The two arms of an angle meet at the . The angle formed by a straight line is °.
7.True or false? Every angle smaller than 90° is acute.
TrueFalse
8.A gate is open at 90°. It opens a little farther. What kind of angle does it make now? Explain how you know.

Design a tricky turn

Create an angle that could be used for a mini-golf path. Draw two arms meeting at a vertex, then label the angle type and its approximate size.

Choose an acute, right or obtuse angle. Label the vertex and both arms.
9.Write the angle type you chose and give one possible size in degrees. Your size must match the angle type.

2 printable pages

  • Understanding Angles and Types, page 1 of 2: Spot the angle, Angles on the course

    Page 1

  • Understanding Angles and Types, page 2 of 2: Design a tricky turn

    Page 2

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