Students complete nine problems about supplementary angle sums, finding a missing supplementary angle of 108°, and splitting a right angle into two equal parts. The matching activity connects four real objects — a book corner, a clock at 2:00, a pizza slice tip, and open scissors — to 90°, 150°, 30°, and 60°.
Real-world angle estimation connects abstract degree measures to objects students can visualize and check.
Style:
Angles and Angle Measurement
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Two angles on a straight line add up to 180 degrees.
2. If angle A is 72° and angle B together with A makes a straight angle, then angle B is 108 degrees.
3. A right angle split into two equal parts makes two angles of 45 degrees each.
4. An angle of 38° and an unknown angle form a right angle. The unknown angle is 52 degrees.
5. Three angles of 60° each make a straight angle.
6. An obtuse angle must measure more than 90° but less than 180 degrees.
7. If a straight angle is split into angles of 95° and x°, then x = 85.
8. Two complementary angles add up to 90 degrees.
9. A half turn is the same as a straight angle.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Corner of a book
→ 90°
30°
Hands of a clock at 2:00
→ 60°
90°
Slice of pizza tip
→ 30°
60°
Wide-open scissors
→ 150°
150°
Angles and Angle Measurement
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) Two angles on a straight line add up to 180 degrees.
2) If angle A is 72° and angle B together with A makes a straight angle, then angle B is 108 degrees.
3) A right angle split into two equal parts makes two angles of 45 degrees each.
4) An angle of 38° and an unknown angle form a right angle. The unknown angle is 52 degrees.
5) Three angles of 60° each make a straight angle.
6) An obtuse angle must measure more than 90° but less than 180 degrees.
7) If a straight angle is split into angles of 95° and x°, then x = 85.
8) Two complementary angles add up to 90 degrees.
9) A half turn is the same as a straight angle.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Corner of a book
→ 90°
30°
Hands of a clock at 2:00
→ 60°
90°
Slice of pizza tip
→ 30°
60°
Wide-open scissors
→ 150°
150°
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
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