The Surface Area of a Cylinder Formula is
$\large Surface\;Area\;of\;a\;Cylinder=2\pi r(r+h)$
r is the radius of the circular base of the cylinder.
h is the height of the parallel face of the cylinder
Question 1: What will be the surface of the cylinder with height 10 cm and diameter of the base is 12 cm.
Height = 10 cm
Diameter = 12 cm
According to the formula: $2\pi r(r+h)$
$=2\times 3.14 \times 6(6+10)$