Students complete nine sentences classifying 55° as acute, computing complementary angle sums, and finding 90° + 40°. The matching activity pairs four angle descriptions — exactly 90°, between 90° and 180°, exactly 180°, and less than 90° — with right, obtuse, straight, and acute labels.
Matching degree ranges to angle names reinforces classification as a measurable boundary rather than a visual judgment.
Style:
Angles and Angle Measurement
Part A: Fill in the Blank
Write the missing word or number on each line.
1. An angle of 55° is classified as acute.
2. If two angles together form a right angle, they add up to 90 degrees.
3. An angle of 90° plus an angle of 40° equals 130 degrees.
4. A straight angle minus 65° equals 115 degrees.
5. An angle of 162° is classified as obtuse.
6. Two angles that add up to 90° are called complementary angles.
7. If one angle in a pair of supplementary angles is 110°, the other is 70 degrees.
8. A quarter turn measures 90 degrees.
9. If one angle of a straight angle pair is 45°, the other is 135 degrees.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Exactly 90°
→ Right angle
Obtuse angle
Between 90° and 180°
→ Obtuse angle
Acute angle
Exactly 180°
→ Straight angle
Right angle
Less than 90°
→ Acute angle
Straight angle
Angles and Angle Measurement
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) An angle of 55° is classified as acute.
2) If two angles together form a right angle, they add up to 90 degrees.
3) An angle of 90° plus an angle of 40° equals 130 degrees.
4) A straight angle minus 65° equals 115 degrees.
5) An angle of 162° is classified as obtuse.
6) Two angles that add up to 90° are called complementary angles.
7) If one angle in a pair of supplementary angles is 110°, the other is 70 degrees.
8) A quarter turn measures 90 degrees.
9) If one angle of a straight angle pair is 45°, the other is 135 degrees.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Exactly 90°
→ Right angle
Obtuse angle
Between 90° and 180°
→ Obtuse angle
Acute angle
Exactly 180°
→ Straight angle
Right angle
Less than 90°
→ Acute angle
Straight angle
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
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