3 years ago

A certain coin is a circle with diameter 18mm. What is the exact area of either face of the coin?

Mathematics

2 answers:

MaRussiya [10]3 years ago

7 0

Answer:

81pi mm^2

Step-by-step explanation:

The radius is 1/2 the diameter, and is used in finding the area of a circle.

The formula for this is

A = pi(r)^2

So the formula you would use is

A = pi (9)^2

= 81pi

Usually teachers accept it in terms of pi, but if not, you can use 3.14 and multiple it.

I hope this helped!

Svet_ta [14]3 years ago

3 0

Answer is answer is 81

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