Measure of each interior angle of a regular polygon can never be?

A train 130 meters long travelling at 54 km/hr crosses the bridge in 30 sec. Then the length of the bridge is:

If the length of a rectangle becomes double and its breadth becomes three-fourth, then find the percentage increase in its area.

In a right angle triangle, the product of two sides is half of the square of the third side (i.e., hypotenuse). Accordingly find out the acute angle?

Angle bisectors of Q and R meet at point S, inside the triangle PQR. If angle QSR = 125˚ , then the measure of angle P is:

The length and breadth of a rectangle are increased by 10% and 20% respectively. The increase in the area of the resulting rectangle will be:

The perimeter of the rectangle is 50 cm and the breadth is 4 times the length. Find the area of rectangle.

Find how many cubes of side 1 cm each can be made by melting a cuboid with dimensions 20cm × 40cm × 5cm?