1.)r=9.5 cm

=9.5×2×3.14

c=59.66 cm

2) d=14m

=14×3.14

c= 43.96 m.

3) r=4.2 in

=4.2×2×3.14

c=26.38 in.

4.) d=28 dm

= 28×3.14

c=87. 92 dm.

NOTE THAT:

when calculating circumstances which is the whole value of a circle

radius should multiply to 2 first then to π =3.14.

while in the diameter you don't have to multiply it by 2.

hope it helps;)

Using π =3.14, find the circumference

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SOLUTION

• π r²
• (3.14)(9.5)²
• (3.14)(19)
• 

to

• Therefore, the answer is 59.66 cm

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SOLUTION

• πd
• (3.14)(14)
• 

• Therefore, the answer is 14 m

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SOLUTION

• π r²
• (3.14)(4.2)²
• (3.14)(8.4)
• 

• Therefore, the answer is 26.376 in

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SOLUTION

• πd
• (3.14)(28)
• 

• Therefore, the answer is 87.92 dm

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