Posted by Jim on October 30, 2002 at 19:39:48:
In Reply to: Re: Area help needed posted by Brad Paul on October 30, 2002 at 12:25:01:
: : The parralel sides of the trapezium are:
: : 19.3 and 9
: : So 8.6*(19.3+9) should = 243.38
: : I hope the text book is wrong, doubt it though...anyone care to show what they get?
: Look at the equation I gave you in my 1). It gives:
: To derive this equation (which I did because I always forget this
: stuff) is to draw a trapezium and label the height h and the top and
: bottom lengths say t, and b. Now break your figure into two triangles
: and one rectangle. Find the area of all three then simplify the sum.
That did the trip, a real help. I found out the main problem with this was because I was doing it so late at night and I was forgeting to divide the following by 2:
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