If a flag-staff of 6 meters height placed on the top of a tower throws a shadow of  23 meters along the ground then the angle (in degrees) that the sun makes with the ground is

Let OA and AB be the shadows of tower OP and flag staff PQ respectively on the ground. Suppose the sun makes an angle  θ with the ground.Let OA=x . In triangles OAP and OBQ, we have tanθ=hx  and tanθ=h+6x+23∴  hx=h+6x+23 hx+23h=hx+6x         ⇒23h=6x         ⇒x=h3∴  tanθ=hx         ⇒tanθ=3         ⇒θ=600