tentukan luas daerah yg diarsir......

Ljuring A=1/6 × phi × r × r
=1/6 × 3,14 × 11 × 11
=63,323 cm^2
Ljuring B=1/6 × phi × r × r
=1/6 × 3,14 × 6 × 6
=18,84 cm^2.
Larsir=Ljuring A - Ljuring B
=(63,323 - 18,84)cm^2.
=44,483 cm^2.
Maaf kalo salah;D