Question

the inner and outer radii of a cylindrical pipe are 4cm and 5cm respectively. Find the area of cross section of the pipe. Use pie = 3.14

Answer 1

2*3.14(25-16)
56.52
$2\pi(25 - 16)$
56.52

Answer 2

πR^2-πr^2
=>314/10×5×5-(314/10×4×4)
=>785-502.4
=>282.6cm^2