tolong di jawab ya gank

L½LINGKARAN
=½ × π×r²
=½ × 3,14× 20 × 20
=3,14 × 20 ×10
=628cm²

L½lingkaran
=½ × π×r²
=½ × 3,14 × 12 × 12
=3,14 × 12 × 6
=226,08

Larsiran
=628-226,08
=401,92cm²