If `A` is the area and `C` is the circumference of a circle, then its radius is (a)`A/C` (b) `(2A)/C` (c)`(3A)/C` (d) `(4A)/C`

If A is the area and C is the circumference of a circle,then its radius is (A)/(C)( b) (2A)/(C)(3A)/(C) (d) (4A)/(C)

The ratio of the area and circumference of a circle of diameter d is (a) d (b) d/2 (c) d/4 (d) 2\ d

The circumference of a circle is 44 cm. Its area is (a)77 c m^2 (b) 154 c m^2 (c)208 c m^2 (d) 144 c m^2

If the difference between the circumference and radius of a circle is 37 cm, then its area is (a) 154\ c m^2 (b) 160\ c m^2 (c) 200\ c m^2 (d) 150\ c m^2

If the difference between the circumference and radius of a circle is 37 cm, then its area is (a) 154\ c m^2 (b) 160\ c m^2 (c) 200\ c m^2 (d) 150\ c m^2

The area of a circle of circumference C is (a) (C^2)/(4pi) (b) (C^2)/(2pi) (c) (C^2)/pi (d) (4C^2)/pi

The circumference of a circle is 22cm. The area of its quadrant (incm^(2)) is: (77)/(2) (b) (77)/(4) (c) (77)/(8) (d) (77)/(16)

If the circumference and the area of a circle are numerically equal, then diameter of the circle is (a) pi/2 (b) 2pi (c) 2 (d) 4

If the circumference and the area of a circle are numerically equal, then diameter of the circle is (a) pi/2 (b) 2pi (c) 2 (d) 4

Find the rate of change of the area of a circle with respect to its radius r when(a) r = 3 c m (b) r = 4 c m