a well of a diameter 150 cm has a 30 cm wide parapet running around it .find the area of parapet
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Given, the diameter of the well (d) = 150 cm.
Let radius and diameter of the parapet is R and D respectively.
Sine, length of the outer edge of the parapet = 770 cm.
Therefore,
2πR = 770 cm
2R = 770 / π = (770 x 7 )/22 = 245 cm
D = 245 cm.
Now, width of the parapet = ( diameter of parapet - diameter of the well)/2 = (245 - 150 )/2 = ( 95)/2 = 47.5 cm
Hence, width of the parapet is 47.5 cm.
hope this helps you
Let radius and diameter of the parapet is R and D respectively.
Sine, length of the outer edge of the parapet = 770 cm.
Therefore,
2πR = 770 cm
2R = 770 / π = (770 x 7 )/22 = 245 cm
D = 245 cm.
Now, width of the parapet = ( diameter of parapet - diameter of the well)/2 = (245 - 150 )/2 = ( 95)/2 = 47.5 cm
Hence, width of the parapet is 47.5 cm.
hope this helps you
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