Question

the surface area of a cylinder whose base radius is 3.5cm and height 7cm is​

Answer 1

Question

the surface area of a cylinder whose base radius is 3.5cm and height 7cm is

Answer

• We will use this formula 2πr(r+h)

$\sf{ 2 \times \frac{22}{7} \times 3.5(3.5 + 7) } \\ \\ \sf{ \cancel2 \times \frac{22}{ \cancel7} \times \frac{ \cancel{35}}{ \cancel{10}} ( \frac{35}{10} + 7)} \\ \\ \sf{22 \times ( \frac{70 + 35}{10} )} \\ \\ \sf{22 \times \frac{105}{10} } \\ \\ \sf{ \frac{231 \cancel0}{1 \cancel0} } \\ \\ \sf{231cm^{2} }$

So surface area of a cylinder is 231cm²