CUET Preparation Today
What is the diameter (in cm) of a sphere of surface area 154 sq cm? |
3.5 14 10.5 7 |
7 |
Surface area of a sphere = 4\(\pi \)r2 = 154 ⇒ r2 = \(\frac{154 × 7}{22 × 4}\) ⇒ r2 = \(\frac{49}{4}\) ⇒ r = \(\frac{7}{2}\) ⇒ diameter = 3.5 x 2 =7cm |
