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Math Help - Geometry, perimeter, area of a triangle

  1. #1
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    Geometry, perimeter, area of a triangle

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    16


    please show me how to find the perimter and area of above triangle. thanks.
    suwanee
    Last edited by Suwanee; May 29th 2007 at 08:42 PM. Reason: Are there drawing tools that we can use?
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  2. #2
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    earboth's Avatar
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    Quote Originally Posted by Suwanee View Post
    * *
    ***** 20
    ****** *
    * ****** *
    * **********
    * ********** *
    * ************* *
    *******************
    16


    please show me how to find the perimter and area of above triangle. thanks.
    suwanee
    Hello,

    I assume that your triangle is a right triangle.

    1. Perimeter. You know already the length of 2 sides. Use Pythagorean theorem to find the 3rd side:
    s=\sqrt{20^2 - 16^2}=12

    Thus the perimeter is p = 20 + 16 + 12 = 48

    2. Area: The area of a right triangle is the half of a rectangle. The sides of the rectangle are the legs of the right angle. Thus
    A_{rectangle}=16 \cdot 12 = 192
    Therefore the area of the triangle is 96 square units.
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  3. #3
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    thanks!!!

    Thank you Earboth!!!!!
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