Question 78

What is the diameter (in cm) of a sphere of surface area 154 sq cm?

Solution

Surface area of sphere = 154

$$4\pi r^{2} = 154$$

$$4\times \frac{22}{7}r^{2} = 154$$

$$r^{2} = 12.25$$

$$r = 3.5$$

$$diameter = 2r = 7$$

So the answer is option D.

Share on Whatsapp Share on Whatsapp

Create a FREE account and get:

Free SSC Study Material - 18000 Questions
230+ SSC previous papers with solutions PDF
100+ SSC Online Tests for Free

Follow us on

Boost your Prep!

Download App