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pi kali d1 kali d2
22/7×7×3
66
1/2×a×t
1/2 × 6×7
21
21+66=87
luas layang-layang : 1/2 x ( 3 + 3 ) x ( 7 + 4 ) =
: 1/2 x 6 x 11
: 1/2 x 66
: 33 cm²