Question

Mayank made a bird-bath for his garden in the shape of a cylinder with a hemispherical depression at one end (Fig. 13.9).

Answer 1

Primary SchoolMath5+3 pts

Mayank made a bird bath for his garden in the shape of a cylinder with a hemispherical depression at one end .the height of the cylinder is 1.45m and its radius 30 cm .find the total surface area of the bird bath

Report by Brkkhan 07.03.2017

Answers



THE BRAINLIEST ANSWER!

Deepikakvvk06 Maths AryaBhatta

Height , h = 1.45 m
Radius , r = 30 cm = 0.3 m

Total Surface area of the bird bath = T.S.A of Cylinder

T.S.A of Cylinder = 2πr(r+h)
= 2 × 22 / 7× 0.3 (0.3 +1.45)
= 3.3 m²


As the cylinder is attached to a hemispherical depression , its area is not added.If the cylinder was attached to a base , it would have been calculated...

Answer 2

Answer:

Let h be height of cylinder and ,r the common radius of cylinder and hemisphere.

Total, surface area of bird- bath

= CSA of cylinder + CSA of hemisphere

$\bf = 2πrh +2πr² \\ \\ \bf </p><p>= 2πrh+2πr²=2πr(r+h) \\ \\ \bf </p><p>= 2× \frac {22}{7} ×30(145+30) cm²</p><p>\\ \\ \bf =33000cm² \\ \\ \bf 3.3m²$