QQuestion
Find the total surface area of a cone whose diameter of the base is 20 cm and slant height is 25 cm.
✓Answer
Diameter = 20 cm ⇒ radius (r) = 10 cm
Slant height (l) = 25 cm
Total Surface Area (TSA) of cone = πrl + πr²
= π × 10 × 25 + π × 10²
= 250π + 100π
= 350π cm²
TSA = 350 × \frac{22}{7} = 1100 cm²
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