i need to find the area of this irregular shape "expressed in terms of pi"\n\nmy final answer right now is:  135 + 10.125pi \n\nwould that be expressing it in terms of pi?
121348
Yes it is, because you did not multiply by an approximation of pi, you left the pi whole, so to speak :).  It's more accurate that way.
563132
I knew it as I did the activity.Draw a circle an divide it into 8 equal parts.It should be equal.Then cut it and stick such that the tip of one cone is up and the other is down.See that the edges stick each other close together.Do it until you finish all the 8 parts.\nNow you needed some concentration.You can see that it forms a parallelogram.Now area of parallelogram=base*height and the circumference of circle=Pi*2*radius.The base of the diagram is half the circumference that is Pi*radius,and the height will be the radius.You will also notice that Area of parallelogram=Area of circle.Therefore,Base*height=Pi *Radius *radius.so, now you have got pi*radius square.\nHope you like my answer.
445104
Sigh - first guy had it right, but didn't explain it all.  \nPi = 3.14- all you need for the problem\nRadius= half the diameter of your circle. You find the midpoint and measure from there to the side of the circle, in any direction. Most problems give you the radius. or at least show you the midpoint on the circle.\n\nSo, it is 3.14 x the amount of the radius x 2= the area of the circle.\n\nYou can do this in reverse as well, if you know the area but not the radius.
306101
Okay, I got something really different, but it might be wrong, I used tangents and stuff to figure it out, and I assumed a dodecagon had 12 sides, but I might be wrong. Anyways, I got 38.4 for the perimeter, and 115.2 for the area.
267072
I get 8/pi as well.\ndivide up into cylinders each element 2pixsin(pix/2)dx integrate by parts gives:\n(-4cos(pix/2))+((8/pi)sin(pix/2))evaluated at 1 and zero.\nonly nonzero term is rhs at 1 which gives 8/pi.
506944
The area of a triangle is half base times height.\n\nCould you properly define the length of the base, height and hypotenuse?
290140
Rec first  8 X 4 = 32\n32 X 16 = 512  this is Area of rectangle.\n\nCircles pi X r^2 = Area\n3.14159 X 8 X 8 = 201\n\n512 - (2 X 201) = shaded area\n109.87 = shaded area\n\nOK ?
81510
coterminal angles differ by 360 degrees (or 2pi)\nso add 2pi to pi/4 . . . [pi/4 + 8pi/4 = 9pi/4] -->because 2pi = 8pi/4\nand subtract 2pi. . .you can do it!\n\nanswer this: what is 2 + 1/4?\nand this:   what is 8/4 + 1/4
518789
Area = pi r^2\nd Area/ dr = 2 pi r\n\nd Area = 2 pi r dr\n\nGiven d Area = 2 dr,  so substitute to get 2 dr = 2 pi r dr\n\n1 = pi r\n\n1/pi = r
635893
3 is a very, very rough estimate. It's calculated using a Taylor series. The best info I've found is here\nhttp://www.jimloy.com/geometry/pi.htm
438250
2 X pi X  r = cirumference\n\npi X r squared = area
296076
the correct option is e \n the value of i radian is 180/pi = 57.3248 ( if pi is 3.14)
369054
It equals (2/3)*pi.   It does not equal (-1/3)*pi  -- that would be (-inverse cosine (-1/2)).
225741
the formula for the area of any regular shape is \n(pa)/2, so there is no multipling the base by 2 involved.\np=perimeter\na=apothem
572887
here goes again .. seems like im gona do the whole hw for u ;) to find the limit of the area that ur gona revolve around the x=-2 axis u have to draw the two equations again and the area enclosed is basicly the shape of a circle (not a perfect circle though) and its located right above the x-axis touching it from below and the center of it is on the y-axis .. now the limit is the intersection of these two euations y=x^2 and y=2-x^2 that is x^2= 2- x^2 ==> 2*x^2 = 2 ==> x^2=1 ==> | x | = 1 ==> x = +1 or x = -1 .. and thats ur interval limits
409963
Find the area under the curve and then divide by the length of the interval.\n\nDo numerical integration (because we want a numerical answer so we don't need a closed form).  If possible, use a calculator or something otherwise do it by hand.\n\n2000 is represented by t=35.\n\nIntegrate 225(1.15)^t from 0 to 35 and the numerical value is 212786.77 and then divide this number by the length of the interval which in this case is 35.\n\nWhich gives you the average value as $6079.62?
489251
It is said that the area of a circle is Pi R square.  Pie are not square. Pie are round, cornbread are square.