Q151 Find circumference of a circle if area of the circle is 154 cm2.

Q152 A regular hexagon is inscribed in a circle of radius 10 cm. Find the area of the shaded portion. (× ≈ 3.14 ; √3 ≈ 1.73).

Q153 The wheel of scooter has diameter 140 cm. How many revolutions per minute must the wheel make so that the speed of the scooter is kept at 132 km per hour?

Q154 The smallest possible circle, touching two opposite sides of a rectangle, is cut out from a rectangle of area 60 sq units. If the area of the circle is 1.5 times the uncut area left in the rectangle, find the diameter of the circle.

Q155 Consider Square S inscribed in circle C, what is the ratio of the areas of S and C? And, Consider Circle Q inscribed in Square S, what is the ratio of the areas of S and Q?

Q156 $Find the radius of the circle if the area of the sector is 924c{m}^2 and the angle at the center is 60°.$

Q157 When the radius of a circle is decreased by 50%, the area of the circle:

Q158 $Find the circumference of a circle if the area of the circle is 154 c{m}^2.$

Q159 A regular hexagon is inscribed in a circle of radius 10 cm. Find the area of the shaded portion. (× ≈ π ; √3 ≈ 1.73).

Q160 The wheel of scooter has diameter 140 cm. How many revolutions per minute must the wheel make so that the speed of the scooter is kept at 132 km per hour?