Question

a closed circular cylinder has diameter 20cm and hight 30cm. find total surface area of cylinder

Answer 1

Diameter=20cm
So, radius=10cm

Height=30cm

Total surface area= CSA of the cylinder +upper part+lower part
                                 =2πh + πr^2 + πr^2
                                 =2×22/7×30 + 22/7×10×10 + 22/7×10×10
                                 
Find the value