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a^2 + b^2 = c^2
10^2 + b^2= 26^2
100 + b^2 = 676
b^2= 676-100
b^2= 576
b=akar dr 576
b= 24
L.perm = 2.L.alas.t
960= 2.1/2.10.24.t
960=240t
960/240=t
4=t
jadi tinggi prisma adalah 4 cm
semoga membantu