CUET Preparation Today
CUET
General Test
Quantitative Reasoning
Mensuration: 3D
The ratio of the curved surface area of two cones is 1 : 4 and the ratio of slant height of the two cones is 2 : 1. What is the ratio of the radius of the two cones? |
1 : 8 1 : 6 1 : 9 1 : 7 |
1 : 8 |
C.S.A of a cone =πrl ATQ, ratio of C.S.A of two cones: ⇒ πr1l1πr2l2 = 14 ⇒ r1r2 × 21 = 14 ⇒ r1r2 = 18 ⇒ r1 : r2 = 1 : 8 |