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segitiga = 1/2 x 10 x 13 = 65 x 4 = 260
100 + 260 = 360
Kemudian luas permukaan ke empat segitinya.
Tinggi limas 12cm
setengah alasnya (alas di segitiga phytagoras) 5cm
Berarti sisi miringnya 13cm. (Phytagoras istimewa 5-12-13)
Lp ke empat segitiga = 4 x = 4 x 65 = 260
Totalnya 100 + 260 = 360