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t1² = 8²+15²
t1² = 64+225
t1² = 289
t1 = √289
t1 = 17 cm
tinggi sisi tegak yang alasnya 30 cm(t2)
t2² = 6²+8²
t2² = 36+64
t2² = 100
t2 = √100
t2 = 10 cm
L = luas alas + 2.12.17/2 + 2.30.10/2
= 30.12 + 204 + 300
= 360 + 204 + 300
= 864 cm²