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no 2 C :
luas lingkaran = π x r²
luas 2/3 lingkaran = 2/3 x 22/7 x 21 x 21 = 2772
no 3 B :
luas 1/2 lingkaran = 1/2 x 22/7 x 21 x 21 = 693
luas segitiga = 1/2 x a x t = 1/2 x 42 x 18 = 378
TOTAL JUMLAH LUASnya = 693 + 378 = 1071
no 3 E :
luas lingkaran besar = 22/7 x 28 x 28 = 2464
luas lingkaran kecil = 22/7 x 14 x 14 = 616
HASILnya = 2464 - 616 = 1848
no 3 D :
luas lingkaran = 3,14 x 10 x 10 = 314
luas segitiga = 1/2 x 10 x 10 = 50
HASILnya = 314 + 50 = 364
no 3 F :
luas 1/2 lingkaran besar = 1/2 x 22/7 x 42 x 42 = 2772
luas 1/2 lingkaran kecil = 1/2 x 22/7 x 14 x 14 = 308
HASILnya = 2772 - 308 = 2464