katlin95
use the illustration below to calculate the circumfrence of the circle.
A. 75.4 cm
B. 24 cm
C. 37.7 cm
D. 452.4 cm



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katlin95
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dw:1364960090111:dw

Hope_nicole
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what is the equation for circumference?

katlin95
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their is no equation

some_someone
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The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.

some_someone
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If a circle has a diameter of 4, its circumference is 3.14*4=12.56

some_someone
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If you know the radius, the diameter is twice as large.

some_someone
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You have enough info @katlin95 to work it out on your own for once :)

katlin95
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its B

katlin95
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is that the right answer guys?

some_someone
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Circumference = 2 • π • radius = π • diameter
Circle Area = π • r² = ¼ • π • d²

katlin95
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yea its B

katlin95
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nevermind its C

some_someone
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A. 75.4 cm

MsSmiley123
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A

some_someone
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they give you 12 cm aka the RADIUS!

some_someone
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Circumference = 2 • π • radius = 2 • π • 12 = 75.39 = 75.4