the diameter of two circles are 3.5 cm and 4.2 cm find the ratio of the area of the smaller Circle to that of the bigger circle
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Answered by
24
area of smaller circle = πr1^2
area of bigger circle = πr2^2
=22/7 * 3.5 * 3.5 = 3.5*3.5= 0.5*0.5= 25
=22/7 * 4.2 * 4.2 =4.2*4.2 =0.6*0.6 = 36
ratio = 25:36
area of bigger circle = πr2^2
=22/7 * 3.5 * 3.5 = 3.5*3.5= 0.5*0.5= 25
=22/7 * 4.2 * 4.2 =4.2*4.2 =0.6*0.6 = 36
ratio = 25:36
goldberg2:
Please explain it in detail
what to explain
This question
i have just find their area and then kept them in ratio
That you had done
Plllllllz explain it again in steps plllllz
Answered by
29
The ratio will be 25:36.
Given data:
Diameter of the smaller circle = 3.5 cm = 35 mm
Diameter of the bigger circle =4.2cm = 42 mm
So,
Radius of the smaller circle = (35/2) = 17.5 mm
Radius of the bigger circle = (42/2) = 21 mm
Area of the smaller circle = {π ×(17.5)²} = 962.5 mm²
Area of the bigger circle = {π × (21)²} = 1386 mm²
So,
The ratio = 962.5 : 1386 = 25:36 (answer)
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