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l = 7 + 5 = 12 cm
luas persegi panjang = p x l
= 20 x 12
= 240 cm²
r = 7 cm
luas 2 x seperempat lingkaran = luas setengah lingkaran
= 1/2 x π x r²
= 1/2x 22/7 x 7 x 7
= 77 cm²
luas arsiran = luas persegi panjang - luas setegh lingkaran
= 240 - 77
= 163 cm² (A)
semoga membantu ya :)
= 1/4 22/7 × 7²
= 1/4 154
= 38,5 cm²
L. lingkrara 1= L lingkaran 2
lebar= 7+5=12 cm
L p.p= P×l
=20×12
=240 cm²
L. daerah arsir = L p.p- (2. luas lingkaran)
= 240cm²-(2.38,5 cm²)
= 240 cm²- 77 cm²
= 163 cm²
jawabannya A. 163 cm²