alleryThe length of a semicircle of radius r is:
A4 pi times r
Bpi r squared
Cpi times r
D2 pi times r
Answer & Solution
Correct answer: C. pi times r
1. The full circumference is 2 pi r.
2. A semicircle is half of the circle.
3. So its arc length is pi times r.
4. The answer is pi times r.
_Source: syllabus Mathematics, Ch 6 'Measuring Space: Perimeter and Area'_
Keep practising Mensuration: Perimeter and Area
Browse all Mensuration: Perimeter and Area questions for CBSE Class 9, or explore more Mathematics topics.
Related questions
Match Heron's formula components for triangle area:Match each hemisphere surface area component (radius r):Match each circular solid with its volume formula:Match each circular 3D solid with its curved surface area (CSA) formula:Spot the one that does not fitFill the gaps on surface areasFind a cone's curved surfacePart of a cone or a sphere