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CB^2 = AB^2 + CA^2
CB^2 = (12)^2 + (16)^2
CB^2 = 144 + 256
CB^2 = 400
CB = √400
CB = 20cm
luas segitiga = 1/2 x a x t
= 1/2 x 16 x 12
= 96 cm^2
keliling segitiga= AB +CB + CA
= 16 + 20 + 12
= 38 cm
untuk 1/2 lingkaran dikali 1/2, diameter = CB = 20 cm , jadi jari jari = 20/2 = 10 cm
π = 3,14
luas 1/2 lingkaran
= 1/2 x π x r x r
= 1/2 x 3,14 x 10 x 10
= 314/2
= 157 cm^2
keliling 1/2 lingkaran
= 1/2 x π x d
= 1/2 x 3,14 x 20
= 31,4 cm