In a triangle ABC, if ∠B = 90°, ∠C = 45° and AC = 4 cm, then the value of BC is
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 2 cm.
Given that
In a triangle ABC, B = 90°, C = 45° and AC = 4 cm,
According to the question
In triangle ABC, cos 45° = BC/AC
BC = 4 × 1/√2 = 2 cm