Mathematics
Four circular cardboard pieces, each of radius 7 cm are placed in such a way that each piece touches two other pieces. The area of the space enclosed by the four pieces is :
42 cm2
40 cm2
21 cm2
18 cm2
Related Questions
Assertion (A): The diameter of a cycle wheel is 21 cm. It will make 2000 revolutions to cover a distance of 1.32 km.
Reason (R): Distance covered by a wheel of radius r in one revolution is given by 2πr.
A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false
In the figure, if the radius of each circle is 5 cm, then area of the shaded region is :
(400 - 50π) cm2
(400 + 100π) cm2
(400 - 100π) cm2
231 cm2
If sum of the areas of two circles with radii r1 and r2 is equal to the area of circle of radius r, then :
r = r1 + r2
r > r1 + r2
r2 < r12 + r22
r2 = r12 + r22