JEE Main 2019 Mathematics question
Not in JEE syllabus
The angles A, B and C of a triangle ABC are in A.P. and . If c = 4 cm, then the area (in sq. cm) of this triangle is:
Answer: (A)
Solution
B = 60°, sin A = 1/2 ⇒ A = 30°, C = 90°; a = 2, b = ; area = .