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= 26+15+10+24
= 75 satuan panjang
=15+(2x13)+(2x5)+(2x12)
=15+26+10+24,
=75 cm
t=√(13²-5²)=√(169-25)=√144=12 cm
Luas bidang
=(12x15)+(12x5)+(7,5x10)
=180+60+75
=315 cm²