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luas=22/7x21/2x21/2=346,5
luas=441+346,5=787,5 cm2
keliling=22/7x21=66
keliling=4x21=84
keliling=66+84=150 cm
22/7x21x1/2x21 1/2 =787,5
kel 22/7x21=66
4x21=84
gg+84=150