Answer:
In triangle ABC and triangle ADE
angle A = angle A (common)
anhle ABC = angle ADE
By AA , triangle ABC similar to triangle ADE
Thus
AB/AD = BC/DE
10/(10+x) = 6/10
60 + 6x = 100
6x = 40
x = 6.67
Explanation:
ΔABC & ΔADE are similar triangles
Cross multiply,
6*(10+x) = 10*10
6*10 + 6*x = 100
6x = 100 - 60
x = 40/6
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