13.
In a A ABC, AB 1 BC, ACB
30°, AB = 15 m, then find the length of
BC.
A
30°
B
С.
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Answer:
Given : A Δ ABC in which AB ⊥ BC ∠ACB = 30° & AB = 15 cm
To find : Length of BC
Solution:
Δ ABC is right angle at B
∠ACB = 30°
=> Tan30° = AB /BC
=> 1/√3 = 15/BC
=> BC = 15√3
Length of BC = 15√3 cm ≈ 26 cm
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