Question

calculate the total surface area of a cone whose radius is 8 CM and height is 12 cm

Answer 1

Answer:

TSA of cone = 563.53cm*2

Answer 2

Answer:

362.469

Step-by-step explanation:

$by \: pythagores \: theorem\\ {l}^{2} = {(8)}^{2} + {(12)}^{2} \\ {l}^{2} \: = 64 + 144 \\ {l}^{2} = 208 \\ l = \sqrt{2 \times 2 \times 2 \times 2 \times 13} \\ l \: = 4 \sqrt{13} \\ then \\ area \: of \: cone = \pi \: r \: l \\ a \: = 3.14159 \times 8 \times 4 \sqrt{13 } \\ a = 362.469$

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