a few questions on circumference if i can get help. will give medal and fan anybody who helps

Question

johnweldon1993 · Answer

What do you need to know?

anonymous · Answer

what do you have a question on?

anonymous · Answer

What is the approximate circumference of a semicircle with a radius of 35 inches?
	
A.1923.25 inches
B.219.8 inches
C.109.9 inches
D.54.95 inches

johnweldon1993 · Answer

You know semicircle is half a circle...

So just calculate the circumference of a full circle with that radius...and divide it by 2

$$\large C_{\text{semicircle}} = \frac{2 \pi r}{2}$$
$$\large C_{\text{semicircle}} = \pi r$$

anonymous · Answer

i dont know what the whole is of a circle

anonymous · Answer

i dont know anything about circumference