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sm² = sd²+st²
= 6²+8²
= 36+64
= √100
sm = 10
luas segitiga : 1/2.a.t = 1/2x6x8=24 cm²
luas persegi panjang : p.l = 6x10 = 60 cm²
L 1+L 2 = 24+60= 84 cm²