Tolong bntu ya mksii

Tolong bntu ya mksii

$frac{40}{360} times luas : lingkaran \ = frac{40}{360} times frac{22}{7} times 21 : cm times 21 : cm \ = frac{1}{9} times 22 times 3 : cm times 21 : cm \ = frac{1}{3} times 22 times 1 : cm times 21 : cm \ = 22 times 1 : cm times 7 : cm \ = 154 : cm^{2}$

2. Gak ada gambarnya?