Question
The total surface area of a cylinder is 2,200 cm². If its
radius is 7 cm and height is expressed as (k + 13), then find the value of ‘k²’. (Use π = 22/7)Solution
ATQ,
Total surface area of cylinder = 2 × π × radius × (radius + height)
So, 2 × (22/7) × 7 × (7 + height) = 2,200
Or, 7 + height = 25
Or, height = 18 cm
Now, k + 13 = 18
Or, k = 5
Required value = 5² = 25
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