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a=s=K/4=64/4=16 cm
T limas= 15
Tinggi segitiga
t²=T²+(s/2)²
t²=15²+8²
t²=225+64
t=√289
t=17 cm
Luas 4 segitiga =4.½a.t=2.16.17=544 cm²
Luas alas = 16×16=256
Luas permukaan
=Luas segitiga + Luas alas
=544+256
=800 cm²