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➷ The formula for circumference is
![\pi d](https://img.qammunity.org/2020/formulas/mathematics/middle-school/sff7i1dl6g8n6an0xvqp199lh0mc2bhip7.png)
1)
![\pi d = 31.4](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5n60iamvjrkzwy5fu6ihkh2fqcvn9fjvek.png)
Divide both sides by
![\pi](https://img.qammunity.org/2020/formulas/mathematics/middle-school/hvs09vob5j95u9hspf0ge6sceeo00vgyv4.png)
d = 9.99 (consider this to be 10)
Half this to find the radius
10/2 = 5
It would be figure B.
2)
![\pi d = 37.68](https://img.qammunity.org/2020/formulas/mathematics/middle-school/jg5lxbagg6g0f7j4y7x0hmn0eq7srtwco2.png)
Divide both sides by
:
d = 11.99 (consider this to be 12)
Divide by 2 to find the radius:
12/2 = 6
It would be figure C.
3) area =
![\pi r^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/69e2ijkvwardlu2n5rrgtkpqc3b44mcw34.png)
![\pi r^2 = 153.86](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gxj8bif2b4cbrh6v8rae3rdshg4sh25c8b.png)
r^2 = 48.97515909
r = 6.998 (consider this to be 7)
It would be figure D
4)
![\pi r^2 = 113.04](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6v6p9a4umrynnzocmz0onk8jnqysb16f17.png)
r^2 = 35.98174
r = 5.998 (consider this to be 6)
It would be figure C.
5) radius = diameter / 2
radius = 3
![\pi (3)^2 = 28.27433](https://img.qammunity.org/2020/formulas/mathematics/middle-school/96t26j6cxazoik938dttj5qj275hv12r02.png)
It would be option C
✽
➶ Hope This Helps You!
➶ Good Luck (:
➶ Have A Great Day ^-^
↬ ʜᴀɴɴᴀʜ ♡