Tolong bantu aku jawab pake cara ya​

Jawaban:

a. Luas p. panjang = p×l

= 32 × 14 = 448 cm ²

Luas stngh lingkaran = πr²/2

Diameter = 14 : 2 = 7

= 22/7 × 7² : 2

= 77 cm²

= Luar p. panjang – l stngh lingkaran

= 448 – 77 = 371 cm²

b. Luas stngh lingkaran = πr²/2

Diameter = 42/2 = 21

= 22/7 × 21²/2

= 693

Luas 2 stngh lingkaran kecil = 1 lingkaran kecil

= 42 – 2 : 2 = 20

= diameter = 20 : 2 = 10

Lingkaran = 3, 14 × 10² = 314

= 693 – 314 = 379

maaf kalo salah ^^