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What is the circumference of a circle whose area is 78.5 mm2?
A. 12.13 mm
B. 13.4 mm
C. 314.4 mm
D. 31.4 mm

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MRSBRANSONGO

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ANSWER:

  • The circumference is 31.4mm.

SOLUTION:

➤We have to use the formula (C = 2πr) to get the circumference of the circle.

  • C = (2πr)
  • C = (2)(3.14)(5mm)
  • C = (2)(15.7mm)
  • C = (31.4mm)

➤We know that the radius is the 5mm because it has a area of 78.5mm² only.

  • (Radius = 5mm)

➤So the circumference is 31.4mm.

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NAMCHAERINLEEYUMIGO

[tex]{ \red{ \boxed{ \red {\boxed { \bold{\blue{\underline{\blue{Question}}}}}}}}}}}}}}}[/tex]

What is the circumference of a circle whose area is 78.5 mm2?

[tex]{ \red{ \boxed{ \red {\boxed { \bold{\blue{\underline{\blue{Choices}}}}}}}}}}}}}}}[/tex]

A. 12.13 mm

B. 13.4 mm

C. 314.4 mm

D. 31.4 mm

[tex]{ \red{ \boxed{ \red {\boxed { \bold{\blue{\underline{\blue{Answer}}}}}}}}}}}}}}}[/tex]

D. 31.4 mm

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[tex]\sf{{\:FORMULA= C = 2πr}}[/tex]

  • [tex]\sf{{\:C = (2πr)}}[/tex]
  • [tex]\sf{{\:C = (2)(3.14)(5mm)}}[/tex]
  • [tex]\sf{{\:C = (2)(15.7mm)}}[/tex]
  • [tex]\sf{{\:C = \sf\underline{{\:(31.4mm)}}}}[/tex]

[tex]\sf{{\:The\ radius\ is\ 5mm\ so\ the\ circumference\ is\ \sf\underline{{\:(31.4mm)}}}}}}[/tex]

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