tolong jawab pakai caraa

a

k = 1/2 × 2πd
= 1/2 × 2 × 22/7 × 14 × 14
= 1/2× 2 × 616
= 1/2 × 1.232
= 616 cm2

b. keliling persegi
= 2 × { panjang + lebar}
= 2 × ( 12 + 9 )
= 2 × 21
= 42 cm2

keliling 1/2 lingkaran
= 1/2 × 2πd
= 1/2 × 2 × 3,14 × 9
= 3,14 × 9
= 28,26 cm2

k gabungan
42 cm2 + 28,26 cm2
= 70,26 cm2

cek rumusnya ya. sy sdikit tau