Question

Diameter of a cylindrical pillar is 84cm and its length is 120cm.Find its CSA and TSA.

Answer 1

Answer:

curved suraface area, CSA = 31651.2cm^2

Total surface area, TSA= 42728.4 cm^2

Step-by-step explanation:

It is given that,

Diameter = 84 then radius  r= 42 cm

height h= 120

CSA - curved surface area

CSA = 2πrh = 2x 3.14 x42 x120 =31651.2

Base area = 2πr^2 = 2 x 3.14 x 42 x 42 =11077.2

To find Total surface TSA

TSA = CSA + base area = 42728.4 cm^2

Answer 2

$\tt \large \: AHOY!!$

given :-

diameter of the cylindrical Piller = 84cm

therefore it's radius = 84/2 = 42cm

height (length) of the cylindrical Piller = 120cm

Formula for the CSA of cylinder is 2πrh

therefore CSA of the cylindrical Piller = 2πrh

= 2 × 22/7 × 42 × 120

= 44 × 6 × 120

= 31680cm²

formula for the TSA of cylinder is 2πr(h + r)

therefore it's TSA = 2πr(h + r)

= 2 × 22/7 × 42(120 + 42)

= 44 × 6 × 162

= 42768cm²

$\tt \large HOPE \: THIS \: HELPS!!$