Question

Exercise 7.1
The ràdius and height of a cylinder are in the ratio 5:7 and its curved surface area
6500 sq.cm. Find its radius and height.
linder has total surface area of 1848 sq.m. Its curved surface area​

Answer 1

Step-by-step explanation:

⇒ = 5 ⇒ = ⇒ = 7r CSA of Cylinder = 5500 2 5500 22 7r 2 5500 7 5 44 5500 5500 5

×

44 ×

⇒ =

⇒ = 500 5

4 125 5

r

= ×

= 625 ∴ = 25

r

7 25 35 ∴ = × =

5

h

∴ Radius = 25 cm, Height = 35 cm

Answer 2

Step-by-step explanation:

let radius be r

and height of cylinder be h.

ATQ, r/h = 5/7

so, let r = 5x and h = 7x

and csa of cylinderis 6500 sq. units

=2×pie×r×h = 6500

= 2×22/7×5x×7x = 6500

= 44×5×x^2 = 6500

from here x can be calculated and further solved ahead by putting value of x in r and h