the internal and external radii of a hollow cylinder are 12cm and18cm respectively if its height is 14cm then - Maths - Surface Areas and Volumes

Question

the internal and external radii of a hollow cylinder are 12cm
and18cm respectively if its height is 14cm then find its total
surface area

Manbar Singh · Accepted Answer

We have,internal radius of hollow cylinder, r = 12 cmexternal radius of hollow cylinder, R = 18 cmHeight, h = 14 cmNow, TSA = inner CSA + outer CSA + area of 2 rings⇒TSA = 2πrh + 2πRh + 2πR2-r2⇒TSA = 2×227×12×14 +  2×227×18×14 + 2×227182-122⇒TSA = 1056 + 1584 + 447×180⇒TSA = 2640 + 79207 = 264007 = 3771
43 cm2

the internal and external radii of a hollow cylinder are 12cm and18cm respectively. if its height is 14cm then find its total surface area.