Wednesday

August 20, 2014

August 20, 2014

Posted by **azis** on Thursday, August 15, 2013 at 6:05am.

- spc -
**Reiny**, Thursday, August 15, 2013 at 8:29amBend it down the middle and form into a trough with angle Ų

The area of the cross-section of the trough will be

(1/2)(12)(12) sinŲ

= 72 sinŲ

d(area)/dŲ = 72 cosŲ

= 0 for a max of area

72 cosŲ = 0

cosŲ = 0

Ų = 90° or 270° , the last can be rejected

So when Ų = 90°

the area of the cross section will be

(1/2)(12)(12)sin90 = 72 square inches

**Related Questions**

pre-calc - construction of a rain gutter: a piece of rectangular sheet metal is ...

geometry - a piece of rectangular sheet metal is 20 in. wide. It is made into a ...

mathematics - Please help me answer this question; 1.A metal gutter open at the ...

Math Wrod Problem - 1. A long strip of copper 8 inches wide is to be made into a...

Pre-Calc) - a piece of rectangular sheet metal is 20 in wide. It's to be made ...

calculus - A long rectangular sheet of metal, 12 inches wide, is to be made into...

math - You are designing a rain gutter made from a piece of sheet metal that is...

math problem - A simple rain gutter is constructed using a sheet of aluminum ...

physics - An infinitely long thin metal strip of width w=12cm carries a current ...

physics - An infinitely long thin metal strip of width w=12cm carries a current ...