JEE 2020 Mathematics : Solution of Triangle - 01 (01.10.2019)

If the sides of a Δ be (x² + x + 1), (2x + 1) and (x² – 1), then the greatest angle is

In triangle , if ∠A = 45°, ∠B = 75°, then  =

In triangle ABC if , then the triangle is

In a triangle, the length of the two larger sides are 10 cm and 9 cm respectively. If the angles of the triangle are in A .P., then the length of the third side in cm can be

The area of a triangle ABC, where , B = 45⁰, C = 60⁰ is :

A tower is situated on horizontal plane. From two points, the line joining three points passes through the base and which are a and b distance from the base. The angle of elevation of the top are α and 90° – α and θ is that angle which two points joining the line makes at the top, the height of tower will be

A person observes the angle of elevation of a building as 30°. The person proceeds towards the building with a speed of After 2 hours, he observes the angle of elevation as 45°. The height of the building (in meter) is

In a ΔABC, if then the value of  is