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BC ÷ CD = AC ÷ EC = AD ÷ EB
8 ÷ 8 = (8 + AB) ÷ (8 + 9)
AB + 8 = 17
AB = 9
AC = 8 + 9 = 17
tinggi segitiga ACD = AD
sisi miring segitiga ACD = AC
alas segitiga ACD = CD
AD^(2) = AC^(2) - CD^(2)
AD^(2) = 17^(2) - 8^(2)
AD^(2) = 225
AD = 15
EC/BC=AC/DC
17/8=AC/8
AC=17
ACpangkat2 - CDpangkat2 = 17^2 - 8^2
289-64=225