Question

c.s.a of a cylinder is 1/3rd of its t.s.a. what is it?​

Answer 1

Answer:

1.75 cm

Step-by-step explanation:

For a solid cylinder,

Curved surface area=2πrh

Total surface area=2πrh+(πr

2

)×2

ATQ, 2πrh=

3

1

(2πrh+2πr

2

)

⇒4πrh=2πr

2

⇒2h=r

for r=3.5cm

h=

2

3.5

h=1.75cm.

Answer 2

Step-by-step explanation:

For a solid cylinder,Curved surface area = 2π rh Total surface area = 2π rh + (π r2) × 2 ATQ, 2π rh = 13(2π rh + 2π r2) 4π rh = 2π r2 2h = r