Which formula is used to find circumference of a circle when the radius is given?

Question

Answers :
C = 2r
C = r
C = 2d
C = r²

Answer 1

C = 2πr

Answer 2

There is no π answer

Answer 3

If π is not given as an option, then the alternative formula to find the circumference of a circle with the radius (r) given, is:

C = 2 * r * 3.14159

This formula uses an approximation of pi (~3.14159) in place of the symbol "π".

Answer 4

Do you know what the answer is?

Answer 5

Yes, the correct formula used to find the circumference of a circle when the radius is given is:

C = 2 * π * r

π (pi) is a mathematical constant approximately equal to 3.14159, and it represents the ratio of a circle’s circumference to its diameter.

Answer 6

Can you shorten it!

Answer 7

The formula to find the circumference of a circle with radius (r) given is:

C = 2πr

Answer 8

The only answers are C = 2r, C = r, C = 2d , and C = r²

Answer 9

In that case, the closest answer from the options provided is:

C = 2r

This formula gives the circumference of the circle directly based on the radius.

Answer 10

Which formula is used to find the area of a circle when given the radius? Answers possible: A = r², A = 2r , A = r , A = d²

Answer 11

The formula used to find the area of a circle given the radius is:

A = πr²

Since π was not included in the possible answers, the closest option is:

A = r²

This formula calculates the area of a circle directly based on the radius.