Geometry and TrigonometryEasyFraction of a circle in a quarter turn
Geometry and Trigonometry practice question
A sector of a circle has a central angle of 90°. What fraction of the whole circle's area does the sector cover?
Answer: 1/4 or 0.25
90° is a quarter of the 360° in a full turn, so the sector is 1/4 of the circle.
Common wrong answers
- If you answered 90
- 90 is the angle, not a fraction.
- If you answered 1/2
- 1/2 would be 180°.
- If you answered 1/9
- 1/9 comes from dividing 90 by a wrong total.
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