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La=2.(1/2.a.t)=a.t=12.5=60 cm^2
Sisi miring segitiga=akar 12^2+5^2=akar 144+25=akar 169=13
Luas selimut=(5.16)+(12.16)+(13.16)=480 cm^2
LP=60+480=540 cm^2
x² = 12²+5²
x² = 144+25
x² = 169
x = √169
x = 13 cm
L = 2.luas alas + kel alas.tinggi
= 2.12.5/2 + (12+5+13) . 16
= 60 + 30.16
= 60 + 480
= 540 cm²