Question

.A glass jar has a plastic lid. The jar and the lid are
both cylindrical. The radius and the height of the
jar are 3.5 cm and 10 cm and those of the lid are
3.6 cm and 1.3 cm. Find the surface area of the
glass and of the plastic lid separately.

plz answer .​

Answer 1

Answer:

Note :

Both the lid and the jar are open cylinders.

The formula for getting the surface area of a cylinder is as follows :

Surface area of an open cylinder equals :

(pie × r × r) + (pie × 2r × height of the cylinder)

Surface area of the cylinder jar :

(22/7 × 3.5 × 3.5) + (22/7 × 2 × 3.5 × 10)

= 38.5 + 220 = 258.5

Surface area of the lid :

(22/7 × 3.6 × 3.6) + (22/7 × 2 × 3.6 × 1.3)

= 40.73 + 29.42 = 70.15

Answer 2

Answer:

Both the lid and the jar are open cylinders.

The formula for getting the surface area of a cylinder is as follows :

Surface area of an open cylinder equals :

(pie × r × r) + (pie × 2r × height of the cylinder)

Surface area of the cylinder jar :

(22/7 × 3.5 × 3.5) + (22/7 × 2 × 3.5 × 10)

= 38.5 + 220 = 258.5

Surface area of the lid :

(22/7 × 3.6 × 3.6) + (22/7 × 2 × 3.6 × 1.3)

= 40.73 + 29.42 = 70.15 .