Grade 7 Mathematics · Strand 4: Geometry · Angles
Angles on a Straight Line
A short Grade 7 Mathematics lesson for the CBE curriculum, part of Geometry: Angles. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. Two adjacent angles lie on a straight line and meet at a common vertex. What is the sum of their sizes?
- A. 90°
- B. 180°
- C. 270°
- D. 360°
2. On a straight line AB, a ray OC makes an angle of 137° with OA. Which statement about angle BOC is correct?
- A. It is 43° and acute
- B. It is 53° and acute
- C. It is 43° and obtuse
- D. It is 223° and reflex
3. Three adjacent angles on a straight line measure 52°, y and 63°. Calculate the value of y.
Type your answer (in degrees) in the lesson.
4. Three adjacent angles on a straight railway sleeper beam measure x, 2x and 30°. Find the size of the angle 2x.
Type your answer (in degrees) in the lesson.
5. What name is given to two angles whose sum is exactly 180°?
Type your answer in the lesson.
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