Question

Surface area if a solid cylinderof diameter 4cm and height 20cm in mm^2

Answer 1

$\huge\purple{\underline{\underline{Solution:}}}$

$\sf\red{\underline{\underline{Given:}}}$

• Diameter=4cm
• Radius=2cm
• Height=20cm

$\sf{As\:per\:the\: question}$

• Using formula here

$\sf\pink{\boxed{Surface\:area=2\pi\:r\:h}}}$

$\sf{\rightarrow Area=2*\frac{22}{7}*2*20}$

$\sf{\rightarrow Area=251.428571}$

• Now convert cm to mm
• 1cm=10mm
• 1cm²=100m

$\sf{\rightarrow Area=251.428571*100}$

$\sf{\rightarrow Area=25142.8571\:mm^2}$

$\huge\bold\green{Answer:25142.8571}$