Find:(i) the lateral surface, (ii) the whole surface, and (iii) the

1.	Find:(i) the lateral surface, (ii) the whole surface, and (iii) the volume of a right circular cylinder whose height is 13.5 cm and radius of the base 7cm
Answer» Given: Radius of base, r = 7cm Height , h = 13.5cm (i) Lateral Surface Area of right circular cylinder = 2πrh = 2 x 22/7 x 7 x 13.5 = 2×22×13.5 = 594cm² (ii) Total Surface Area of cylinder = 2πrh + 2πr² = 2πr(h + r) = 2 x 22/7 x 7 (13.5 + 7) = 2×22×20.5 = 902cm² (iii) Volume of cylinder = πr²h = 22/7 x 7 x 7 x 13.5 = 22×7×13.5 = 2079cm³

Find:(i) the lateral surface, (ii) the whole surface, and (iii) the volume of a right circular cylinder whose height is 13.5 cm and radius of the base 7cm

Answer»

Given: Radius of base, r = 7cm

Height , h = 13.5cm

(i) Lateral Surface Area of right circular cylinder = 2πrh

= 2 x 22/7 x 7 x 13.5

= 2×22×13.5

= 594cm²

(ii) Total Surface Area of cylinder = 2πrh + 2πr²

= 2πr(h + r)

= 2 x 22/7 x 7 (13.5 + 7)

= 2×22×20.5

= 902cm²

(iii) Volume of cylinder = πr²h

= 22/7 x 7 x 7 x 13.5

= 22×7×13.5

= 2079cm³