What is the measure of an interior angle of a regular decagon?

Raghunandan sells a machine for Rs 45 lakhs at a loss. Had he sold it for Rs 55 lakh, his gain would have been 9 times the former loss. Find the cost price of the machine.

Find equation of the perpendicular bisector of segment joining the points (2,-5) and (0,7)?

Points P and Q lie on side AB and AC of triangle ABC respectively such that segment PQ is parallel to side BC. If the ratio of AP:PB is 2:3, and area of Δ APQ is 8 sq cm, what is the area of trapezium PQCB?

If a cylinder of radius 4 cm and height 8 cm is melted and constructed into a cone of the same radius, what will be the height of this cone?

If (secA - tanA)2 = x, then the value of x is

If tan(A/2) = x, then the value of x is

What should be the missing digit so that the number 275_476 becomes exactly divisible by 11?