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300 = (24 x d2)/2
d2 = 25
Kita misalkan titip potong diagonal BD dan AC = X, maka
AX = CX = 24/2 = 12
Dengan menggunakan rumus phytagoras, maka
BX^2 = BC^2 - CX^2
BX^2 = 400 - 144
BX^2= 256
BX = 16
Karena BX + XD = 25, maka XD = 9
Gunakan kembali rumus phytagoras pada segitiga AXD
AD^2 = AX^2 + DX^2
= 144 + 81
AD^2 = 225
AD = 15