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    princessgloomy's Avatar
    princessgloomy Posts: 31, Reputation: 1
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    #1

    Nov 28, 2007, 01:12 PM
    Altitude of an Isosceles Triangle
    Ok, find the altitude of an isosceles triangle whose base is 10 and whose congruent sides are 9. I found how to find the alt of a right triangle but still don't really comprende.

    Help :D
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    Nov 28, 2007, 01:35 PM
    Think of the isoceles triangle as cut in half, so that you have two right angle triangles each with base 5 and hypotenuse of 9. You can now calculate the height of those right angle triangles using the Pythagorean theorem.
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