Help someone please...

Mathematics

1 answer:

zalisa [80]3 years ago

6 0

Answer:

303

Step-by-step explanation:

Surface area of cone is $=\pi r^{2} +\pi rl$ , where l is the slant height.

Therefore the area of cone = $3.14 \times( 9^{2}) +(3.14 \times9\times20)$

$=302.6$

round off to nearest whole number, 303

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