Geometry and TrigonometryMediumPerimeter of a semicircle
Geometry and Trigonometry practice question
A semicircle has a diameter of 10. What is the perimeter of the semicircle, including its straight edge?
- A. 5π + 10Correct
- B. 10π + 10
- C. 5π
- D. 25π + 10
Answer: A. 5π + 10
The curved edge is half of 10π, and the straight edge is the diameter, 10.
Why the other answers are wrong
- B. 10π + 10
- This uses the full circumference.
- C. 5π
- This omits the straight edge.
- D. 25π + 10
- This uses the area formula.
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