Question

HELP WITH THIS QUESTION, PLEASE!!!

Answer 1

Answer:

The surface area is multiplied by 2/3.

Step-by-step explanation:

Answer 2

$s.a \: of \: cone = \pi r(l + r) \\ \pi \times 9(12 + 9) \\ 21 \times 9\pi = 189\pi \\ new \: s. a = \pi \times 9 \times \frac{4}{9} (12 + 9) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{4}{9} \times old \: s.a$