In △ABC, right angled at C,AC=4 cm and ∠BAC=60∘, find the length of side BC
5√3cm
3 cm
4√3cm
√3
Since ∠BAC=60∘ ⇒tan60∘=BCAC=√3 ⇒BC4=√3 ⇒BC=4√3 cm
In △ABC, right angled at B, BC = 5cm, ∠BAC = 30∘, find the length of the sides AB and AC.
In a rectangle ABCD, AB = 20 cm, ∠ BAC = 60∘. The length of side BC is :