Question

Find the area to be painted in the following block with a cylindrical hole.

Given that length is 15 cm, width 12 cm, height 20 cm and radius of the hole

2.8 cm.

Answer 1

Answer:

1390.72 sq cm

Step-by-step explanation:

Given  

Find the area to be painted in the following block with a cylindrical hole. Given that length is 15 cm, width 12 cm, height 20 cm and radius

 Length is 15 cm

 Width is 12 cm

Height is 20 cm

Radius of the hole is 2.8 cm

Area to be painted will be Surface area – 2 x Area of circular hole

2 (lb + bh + lh) – 2 πr^2

2(15 x 12 + 12 x 20 + 15 x 20) – 2 x 22/7 x 2.8 x 2.8

2(180 + 240 + 300) – 44 x 2.8 x 2.8 / 7

2 x 720 – 49.28

1440 – 49.28

= 1390.72 sq cm

So area to be painted will be 1390.72 sq cm

Answer 2

Answer:

1390.72

Step-by-step explanation:

I hope you like