Thursday

August 28, 2014

August 28, 2014

Posted by **jazz** on Thursday, November 22, 2012 at 7:50am.

- math -
**Steve**, Thursday, November 22, 2012 at 8:04pmdraw a diagram. There will be two triangles at the ends, aid since 20=30-10, their bases will add up to 10.

If the triangle with hypotenuse 6 has base x, then the height h of the trapezoid is

h^2 = 6^2 - x^2

h^2 = 8^2 - (10-x)^2

so,

36 - x^2 = 64 - (10-x)^2

36-x^2 = 64 - 100 + 20x - x^2

72 = 20x

x = 18/5

h^2 = 36 - (18/5)^2

h = 24/5

area = (20+30)/2 * 24/5 = 120

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