A cylindrical drum has a height of 20 cm and base radius of 14 cm. Find its curved surface area and the total surface area
ans: h=20cm
r =14cm
C.S.A of a cylinder =2πrh
=2×22/7×14×20
=2×22×2×20
=1760cm²
L.S.A of a Cylinder = 2 πrh+ 2πr²
=2x22/7×1420+2x22/7x14x14
=2×22×20+2×22×14
=2992 cm²
ans: h=20cm
r =14cm
C.S.A of a cylinder =2πrh
=2×22/7×14×20
=2×22×2×20
=1760cm²
L.S.A of a Cylinder = 2 πrh+ 2πr²
=2x22/7×1420+2x22/7x14x14
=2×22×20+2×22×14
=2992 cm²
Answers & Comments
h = 20 cm
r = 14 cm
CSA of a cylinder = 2×pie×r×h
=2 × 22/7 ×14×20
= 2 ×22×2×20
= 1760 cm^2
TSA of a cylinder = 2 × pie ×r ( h+ r)
= 2×22/7×14×(20+14)
=2×22×2(34)
=88×34
= 2992 cm^2