3 years ago

How do you do this??

Mathematics

2 answers:

lisabon 2012 [21]3 years ago

8 0

Answer:

131.964 cm

Step-by-step explanation:

$C = 2 \pi r = 2 * 3.142 * 21 = 3.142 * 42 = 131.964 \ cm$

Alex777 [14]3 years ago

6 0

The formula for the circumference of a circle = 2 x radius x pi

The radius is given as 21 cm and pi = 3.142

Circumference = 2 x 21 x 3.142 = 131.964 cm

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