flickchumani flickchumani

30-08-2017
Mathematics

contestada

The area of a circle is 78.5 cm2. What is the diameter of the circle?

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Doerka05 Doerka05

30-08-2017

Your answer is 157, i'm pretty sure

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ghanami ghanami

30-08-2017

hello :
The area of a circle is : A = π × r²
r² = A/π
r² = 78.5/3.14
r² = 25
r = 5
but : d = 2r ... r : ridus and d : the diameter
so : d= 10

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