Question
In a triangle ABC, AB = AC. The length of the median
from A to BC is 9 cm and the angle between the median and AB is 60°. Find the length of AB.Solution
Given: AB = AC, median AD = 9 cm, ∠DAB = 60° In ΔABD: cos(60°) = AD / AB AB = AD / cos(60°) AB = 9 / (1/2) AB = 18 cm
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