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1200 = 100t
t = 1200/100
= 12 cm
tinggi sisi tegak
t ² = 12²+5²
t² = 144+25
t² = 169
t = √169
t = 13 cm
Luas = 100+4(10.13/2)
= 100 + 4(65)
= 100+260
= 360 cm²