Question

a wooden article was made by scooping out a hemisphere from each end of a solid cylinder, as shown in fig. 13.11. if the cylinder,. is 10 cm, and its base is of radius 3.5 cm, find the total surface area of the article.​

Answer 1

Answer:

We have

Height of cylinder= 10cm

radius of base= 3.5cm

Total surface area of the article =Curved surface area of the cylinder +2 surface area of a hemisphere

                                                   =2πrh+2(2πr2)

                                                   =2πr(h+2r)

                                                   =2×722×3.5(10+2×3.5)cm2

                                                   =374cm2