alleryStart learning →Written in terms of radius r, the circumference of a circle equals:
A4 pi r
B2 pi r
C1 pi r
D3 pi r
Answer & Solution
Correct answer: B. 2 pi r
1. The diameter is twice the radius.
2. Pi times twice the radius gives the circumference.
3. So it is 2 pi r.
_Source: syllabus Mathematics Class X, Chapter 12, Areas Related to Circles._
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