Question

if the totel surface area
of a Cylinder is 440 square cm
And the radius is 7cm
What is its heigh?​

Answer 1

Solution:

$\star\ \: \underline{\boxed{\sf{\orange{Total\ surface\ Area\ of\ the\ cylinder =\ \bf 2πr(h+r)\ cm^2}}}}$

$\bf{ \orange{ 2 \times 3.14 \times 7(h + 7) = 440}}$

$\bf{ \orange{6.28 \times 7h + 49 = 440}}$

$\bf{ \orange{7h + 49 = \cfrac{440}{6.28}}}$

$\bf {\orange{7h + 49 \: = 70.063}}$

$\star\;\underline{\boxed{\sf{\pink{h = 3.009cm \approx \: 3cm}}}}⋆$