The area of circle is seven times the numerical value of its circumference. What is the circumference of the circle
Let the radius of circle =r unit
According to question,
πr2=7×2πr
r = 14 unit
Circumference of the circle = 2 × 22/7 × 14
= 88 units
Directions (next five questions) : What will come at the place of question mark (?) in the following number series.
3 4 16 75 364 ?
4000 800 ? 80 40 8
4 10 33 136 ? 4116
10 18 34 ? 130 258
3 1731 ? 3243 3459 3523