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    Yoyoyoo's Avatar
    Yoyoyoo Posts: 1, Reputation: 1
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    #1

    Oct 17, 2007, 01:34 PM
    Altitude of isosc. Triangle?
    I'm so confused rite now. The question is: find the altitude of an isoceles triangle whose base is 10 and whose congruent sides are 9.

    Someone please explain!:confused:
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Oct 17, 2007, 01:46 PM
    Just use Pythagoras. Drop a perpendicular from the top to the midpoint of the base.

    Then the width of that midpoint is 5 and the hypoteneuse is 9
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