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Thread: geometry help :(( grade 12

  1. #1
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    geometry help :(( grade 12



    I rly donít understand how to solve this, if anyone could please help me thatís be great


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  2. #2
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    Re: geometry help :(( grade 12

    For (a), you can split the area of the deck into several areas, then sum the areas for the total

    You can solve the area of the octagon with side length 1.7 (assuming you're given the formula.) $\displaystyle 2(1+sqrt(2))a^2$ where a is the side length

    You can then solve for the remaining deck as the rectangle of length 5.2 and height 4.0 minus the missing triangular top corner of side lengths 1.2 and 1.7 (as 4.0 - 2.8 = 1.2 and 5.2 -4 = 1.2)
    Note: If the triangle were a right angle triangle, the hypotenuse would be slightly less than 1.7. Heron's Formula can be used, though I think (1/2)b*h will be close enough, using 1.2 as base and height.
    Add the areas to get the total area.

    (b) Solve for area of circle of diameter 2
    (c) Area of backyard not covered by deck = Area of backyard - Area of deck
    Last edited by MacstersUndead; Oct 9th 2018 at 09:06 PM.
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