Free practice on Angles for Class 6, following the Cameroon primary school curriculum (English subsystem). Every answer is explained, so a parent who is not sure of the answer can still help.
Acute < 90°. Right = 90°. Obtuse between 90° and 180°. Straight = 180°. Reflex > 180°. Full turn = 360°.
| Type | Range |
|---|---|
| Acute | < 90° |
| Right | = 90° |
| Obtuse | > 90° and < 180° |
| Straight | = 180° |
| Reflex | > 180° |
| Full turn | = 360° |
Angles on a straight line add to 180°. Angles at a point add to 360°. If two angles form a straight line and one is 65°, the other is 180 − 65 = 115°.
| Rule | Sum |
|---|---|
| Angles on a straight line | 180° |
| Angles at a point | 360° |
| Angles in a triangle | 180° |
| Angles in a quadrilateral | 360° |
Place the middle mark on the vertex. Line 0° with one arm. Read the OTHER arm. Use the inner scale if you started at 0° on the inner scale — do not mix them up.
How many degrees are in a straight angle (a straight line)?
Write your answer, then check below.
Answer: 180
How many degrees are in a full turn?
Write your answer, then check below.
Answer: 360
An angle of 75° is:
Answer: A. acute
Less than 90° = acute.
We measure an angle of 90° and it looks like the corner of a book. It is a:
Answer: B. right angle
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