Question

the find the total surface area of cone whose base radius is 8 and sum of base radius and slant height is 21​

Answer 1

Answer:

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Answer 2

Gn: r+l=21

TSA of cone=

$= \pi \times r(l + r)$

$= \frac{22}{7} \times 8 \times 21$

$= 22 \times 8 \times 3$

$= 528$