Question

1) If the diameter of a circle is changed from 8 cm to 4 cm, how will the circumference change?

A) increases by a factor of 2
B) decreases by a factor of 2
C) increases by a factor of 4
D) decreases by a factor of 4

Answer 1

the answer is B.

Explanation:

the formula for circumference of a circle is
`\pi`×diameter=C

`\pi`·8=25.13

`\pi`·4=12.56

12.56·2=25.13