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Luas persegi panjang₁ = p x l = 7 x 4 = 28 cm²
Luas lingkaran₂ = π x r² = 22/7 x 7² = 22/7 x 49 = 154 cm²
Luas 1/4 lingkaran = 1/4 x 154 = 36,5 cm²
Luas daerah yang diarsir = 140 - ( 28 + 36,5 ) = 140 - 64,5 = 76,5 cm²
Jawabannya D
Semoga membantu.
L.yg tdk diraster=
(1/4x22/7x7x7 + 7x4)= 66,5
L.diraster= 140-66,5= 73,5 (c)