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cari sisi panjang alasnya 16²+12²=256+144=√400=20
Lprisma=(2xLa)+(Ka x tprisma)=(2x1/2x16x12)+((16+12+20)x20)=192+960=1152
volume =1/2x12x16x20=1920
gambar 2 ama 3 sama caranya