Year 7 Angles Worksheet — Level 2 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 7 angles worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · AnglesYear 7 Angles Worksheet — Level 2 — Practice Set 4 — Answers
State the angle rule you use.
1.Two angles on a straight line are 106° and x°. Find x.
Answer: x = 74
- Angles on a straight line add to 180°
- x = 180 − 106 = 74
2.Two angles of a triangle are 113° and 38°. Find the third angle.
Answer: 29°
- Angles in a triangle add to 180°
- 180 − 113 − 38 = 29
3.Two angles on a straight line are 131° and x°. Find x.
Answer: x = 49
- Angles on a straight line add to 180°
- x = 180 − 131 = 49
4.Two angles on a straight line are 21° and x°. Find x.
Answer: x = 159
- Angles on a straight line add to 180°
- x = 180 − 21 = 159
5.Two angles of a triangle are 108° and 77°. Find the third angle.
Answer: -5°
- Angles in a triangle add to 180°
- 180 − 108 − 77 = -5
6.Two angles of a triangle are 53° and 100°. Find the third angle.
Answer: 27°
- Angles in a triangle add to 180°
- 180 − 53 − 100 = 27
7.Two angles of a triangle are 31° and 113°. Find the third angle.
Answer: 36°
- Angles in a triangle add to 180°
- 180 − 31 − 113 = 36
8.Two angles of a triangle are 42° and 112°. Find the third angle.
Answer: 26°
- Angles in a triangle add to 180°
- 180 − 42 − 112 = 26
9.Two angles of a triangle are 78° and 104°. Find the third angle.
Answer: -2°
- Angles in a triangle add to 180°
- 180 − 78 − 104 = -2
10.Two angles on a straight line are 139° and x°. Find x.
Answer: x = 41
- Angles on a straight line add to 180°
- x = 180 − 139 = 41
Marking tips
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