Plz help me for the following sum
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Answer:
The Diameter is 42 as given already.
Step-by-step explanation:
I think you got confused at the middle where 7 is being taken as common denominator.
Step 1.
Perimeter Given = 108cm
Perimeter of Semi Circle = πr + 2r
Step 2.
Therefore, As Per Question
πr + 2r = 108
22/7 r + 2r = 108 {Taking Pi Value}
22r/7 + (2r)x7/7 = 108
22r/7 + 14r/7 = 108
36r/7 = 108
r = (108 x 7)/36 {36 x 3 = 108}
So we divide it simply by cancellation
r = 3 x 7 = 21cm (This is the Radius)
Step 3.
Diameter Formula is 2r
Therefore the diameter = 2r = 42cm
That's it. Have a Nice Day.
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