Surface area question
Favorites|Homepage
Subscriptions | sitemap
HOME > > Surface area question

Surface area question

[From: ] [author: ] [Date: 12-04-09] [Hit: ]
and a thickness of 3/4 inch. A drill makes a hole in the plate with a 1-inch diameter. What is the surface area of the steel plate? Round your answer to the nearest inch.Actually, the answer is given to me as 477 square inches,......
A steel plate has a length of 1.5 feet, a width of 1 foot, and a thickness of 3/4 inch. A drill makes a hole in the plate with a 1-inch diameter. What is the surface area of the steel plate? Round your answer to the nearest inch.

Actually, the answer is given to me as 477 square inches, but HOW?

Thanks.

-
Jim's answer forgets one small thing. You must subtract the area of the two circles where the hole has removed some of the plate.
so the area is
2 * (length * height + width * height + length * width - area of circle) + area of cylinder wall.
= 2 * (12* 3/4 + 18 * 3/4 + 12* 18 - pi()*0.5^2 ) +pi()* 1 * 3/4
=477.7854 inch^2

-
2 x (area of top + area of side + area of end) + area of cylinder side

edit: Andrew is correct. My answer is 1.6 sq.in. too large.
1
keywords: area,question,Surface,Surface area question
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .