If the perimeter and the area of a circle are numerically equal, then the radius of the circle is

The area of a circle is 40π² . The area of a square with sides equal to radius of the circle is

If the radius of the circle is increased by 100%, then the area is increased by

If the difference between the circumference and radius of a circle is 37 cm, then the area of the circle is

The perimeter of a rhombus is 100 cm and one of the diagonals is 40 cm. Then the area of the rhombus is

The radius of a circle is 14 cm and the area of a sector is 102.7 sq. cm. The central angle of the sector is