The ratio

The ratio of the lengths of the two circles is 5:2. Find the ratio of a
a) the radii of these circles
b) the areas for these circles

Correct answer:

a =  5:2
b =  25:4

Step-by-step explanation:

o1:o2=5:2 o=2 πr=πD πD1:πD2=5:2  a=5/2=2.5=5:2
2 πr1:2 πr2=5:2 r1:r2=5:2=25=5/2  S=πr2  b=S2S1=πr22πr12  b=r2r1 r2r1  b=25 25=2 25 5=425=641=6.25=25:4

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Math student
Can we take pictures of the problem

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