Question

the diameter of a closed cylinder is 21 cm and height is 10 CM find the total surface area of th​

Answer 1

Step-by-step explanation:

r =21/2 , height = 10 cm TSA of cylinder = 2×22/7×21/2(21/2+10 cm)

66×41/2

33×41

=1353cm square

Answer 2

Step-by-step explanation:

diameter =

$21cm \\ r = 21 \div 2 = 10.5 \\ h = \\ 10cm \\ \\ total \: surface \\ area = 2\pi \: r(h + r) \\ = 2 \times (22 \div 7) \times 10.5(10 + 10.5) \\ = 66 \times 20.5 \\ = 1353cm {}^{2}$