SOLUTION: a rectangle of largest area is cut out from a circle. what percent of area is lost as trimming

Algebra ->  Rectangles -> SOLUTION: a rectangle of largest area is cut out from a circle. what percent of area is lost as trimming      Log On


   



Question 936272: a rectangle of largest area is cut out from a circle. what percent of area is lost as trimming
Found 3 solutions by josgarithmetic, stanbon, MathTherapy:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The rectangle would be a square. The diagonal of the square is a diameter of the circle. One diagonal cuts the square into two 45-45-90 special triangles.

circle, area pi%2Ar%5E2

The diagonal and diameter, 2r.
Let x be the side length of one side of the square.
x%5E2%2Bx%5E2=%282r%29%5E2
and a picture would help you to see that.

2x%5E2=4r%5E2
x%5E2=2r%5E2
x=r%2Asqrt%282%29

Area of the square: r%5E2%2A2, and area of the circle was pi%2Ar%5E2.
Percentage?
highlight%28100%2A%282%2Fpi%29%29

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
a rectangle of largest area is cut out from a circle.
what percent of area is lost as trimming
-----
That rectangle is a square with diagonal equal to the diameter of the circle.
Area of the circle:: pi(d/2)^2 (pi/4)d^2
---
Area of the square:: (d/sqrt(2))^2 = (1/2)d^2
-----
Percent lost = (area of square)/(area of circle) = (1/2)d^2/(pi/4)d^2
-----
= (1/2)/(pi/4) = 2/pi = 64%
-------------
Cheers,
Stan H.
-------------

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

a rectangle of largest area is cut out from a circle. what percent of area is lost as trimming
Percent of CIRCLE lost due to trimming: highlight_green%2836.34%29%
You can do the check!!
===================
If you need a complete and detailed solution, let me know!!
Send comments, “thank-yous,” and inquiries to “D” at MathMadEzy@aol.com.
Further help is available, online or in-person, for a fee, obviously.
For FREE info and answers to questions about the ASVAB exam, the NYS 3 – 8 city/state wide exams,GENERAL
MATH and HOMEWORK QUESTIONS, or MATH QUESTIONS related to the Regents Integrated Algebra,
Regents Geometry, Regents Algebra 2/Trigonometry, SHSAT, COOP/HSPT/TACHS, PSAT, SAT, ACT, SSAT/ISEE,
GRE, CLEP, and the TASC/GED, you can visit: http://asvabstudyzone.freeforums.net/.