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=> √26²-10²=√676-100=√576=24
Luas seluruh sisi tegak
=> 4 x 20 x 24 x 1/2 = 960 cm²
TAB = segitiga samakaki
L seluruh sisi tegak = 4 segitiga = 4 x l TAB
1/2 x 20 x akar 26^2-10^2 = 10 x akar 676-100 = 10 x akar 576 = 10 x 24 = 240
tinggal dikali 4