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 ^^
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