tolong no 2 yaaa!!! plisss

Larsir = 3/4 × phi × r²
           = 3/4 × 22/7 × 21²
           = 1.039, 5 cm²
Thanks

3/4 x 22/7 x 21 x 21= 3/4 x 22 x 3 x 21 = 3/4 x 66 x 21 = 3/4 x 1386 = 1039,5cm2

maaf kalau salah