Worked example
An angle of 90° is split into two adjacent angles. One is 35°. What is the other angle in degrees?
Answer & why
Answer: 55
The two parts add to 90°. 90 − 35 = 55°.
Grade 4 · Math
Find a missing adjacent angle
Use the additive property of angle measures to find a missing part.
6 authored questions + worked example
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All questions
All 6 authored questions for this skill.
Question 1
An angle of 180° is split into two adjacent angles. One is 115°. What is the other angle in degrees?
- 67
- 64
- 65
- 66
A hint
Subtract the known part from the total angle.
Answer & why
Answer: 65
The two parts add to 180°. 180 − 115 = 65°.
Question 2
An angle of 180° is split into two adjacent angles. One is 73°. What is the other angle in degrees?
- 106
- 109
- 107
- 108
A hint
Subtract the known part from the total angle.
Answer & why
Answer: 107
The two parts add to 180°. 180 − 73 = 107°.
Question 3
An angle of 90° is split into two adjacent angles. One is 28°. What is the other angle in degrees?
- 63
- 62
- 64
- 61
A hint
Subtract the known part from the total angle.
Answer & why
Answer: 62
The two parts add to 90°. 90 − 28 = 62°.
Question 4
An angle of 180° is split into two adjacent angles. One is 98°. What is the other angle in degrees?
- 81
- 82
- 84
- 83
A hint
Subtract the known part from the total angle.
Answer & why
Answer: 82
The two parts add to 180°. 180 − 98 = 82°.
Question 5
An angle of 90° is split into two adjacent angles. One is 35°. What is the other angle in degrees?
- 54
- 56
- 57
- 55
A hint
Subtract the known part from the total angle.
Answer & why
Answer: 55
The two parts add to 90°. 90 − 35 = 55°.
Question 6
An angle of 90° is split into two adjacent angles. One is 42°. What is the other angle in degrees?
- 47
- 50
- 49
- 48
A hint
Subtract the known part from the total angle.
Answer & why
Answer: 48
The two parts add to 90°. 90 − 42 = 48°.