Question

13.
In a A ABC, AB 1 BC, ACB
30°, AB = 15 m, then find the length of
BC.
A
30°
B
С.​

Answer 1

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