What is the circumference and the area of a circle that has a diameter of 35 cm?

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Answer 1 · 2016-01-07T17:18:03

Circumference = $110 c m$ $110cm$ and Area = $962.11 c m^{2}$ $962.11cm^2$ .

Diameter is twice radius : $d = 2 r$ $d=2r$ .

$therefore r=d/2=35/2=17.5cm$ .

Circumference : $C=2pir=35pi=110cm$ .

Area : $A=pir^2=pi*17.5^2=962.11cm^2$ .

Answer 2 · 2016-01-07T17:23:42

Circumference = 109.96cm (2 sig. fig.)
Area = 962.11 $cm^2$ (2 sig. fig.)

The radius of a circle is half its diameter. The radius of a circle with a diameter of 35cm is 17.5cm.

The circumference of a circle is found by $2pir$ . So that would be $2*pi*17.5$ which would be equal to 109.96cm (2 sig. fig.).

The area of a circle is found by $pir^2$ . So that's $pi*17.5^2$ which is equal to 962.11cm (2 sig.fig.).