Year 7 Angles Worksheet — Level 3 — Answers
Answer sheet with worked solutions for the Year 7 angles worksheet.
Year 7 · Mathematics · Angles
Year 7 Angles Worksheet — Level 3 — Answers
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State the angle rule you use.
1.Two angles of a triangle are 22° and 63°. Find the third angle.
Answer: 95°
- Angles in a triangle add to 180°
- 180 − 22 − 63 = 95
2.An isosceles triangle has an apex angle of 33°. Find each base angle.
Answer: 73.5°
- Base angles are equal: (180 − 33) ÷ 2
- = 147 ÷ 2 = 73.5
3.An isosceles triangle has an apex angle of 25°. Find each base angle.
Answer: 77.5°
- Base angles are equal: (180 − 25) ÷ 2
- = 155 ÷ 2 = 77.5
4.Two angles of a triangle are 119° and 20°. Find the third angle.
Answer: 41°
- Angles in a triangle add to 180°
- 180 − 119 − 20 = 41
5.An isosceles triangle has an apex angle of 80°. Find each base angle.
Answer: 50°
- Base angles are equal: (180 − 80) ÷ 2
- = 100 ÷ 2 = 50
6.Two angles of a triangle are 65° and 49°. Find the third angle.
Answer: 66°
- Angles in a triangle add to 180°
- 180 − 65 − 49 = 66
7.An isosceles triangle has an apex angle of 41°. Find each base angle.
Answer: 69.5°
- Base angles are equal: (180 − 41) ÷ 2
- = 139 ÷ 2 = 69.5
8.Two angles on a straight line are 87° and x°. Find x.
Answer: x = 93
- Angles on a straight line add to 180°
- x = 180 − 87 = 93
9.Two angles of a triangle are 84° and 52°. Find the third angle.
Answer: 44°
- Angles in a triangle add to 180°
- 180 − 84 − 52 = 44
10.Two angles of a triangle are 83° and 91°. Find the third angle.
Answer: 6°
- Angles in a triangle add to 180°
- 180 − 83 − 91 = 6
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