Results 1 to 3 of 3

Math Help - 4 Math Questions

  1. #1
    Junior Member
    Joined
    Oct 2008
    Posts
    73

    4 Math Questions

    In Attachments
    Attached Files Attached Files
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Jan 2009
    Posts
    145
    First, let's finish filling in some information. If angle AED is 70, then angle BEC must also be 70. Since their sum is 140, the leftover degrees must add up to 220. Since angles AEB and DEC are equal, that means they are each 110 degrees. Angles EDC and ECD must also be equal, so they are both (180 - 110)/2 or 35 degrees. Since ADE and EDC are complimentary, angle ADE must be 55 degrees. Angle EAD is also 55 degrees. Now that we've finished that, we can begin solving for AE.

    Seperate this into two triangles, bisected by line segment AC. The angles for this triangle are EAD (55 degrees), DCE (35 degrees), and ADC (90 degrees). If DC is 15, we can solve for AC by taking the 15/cos(35). AE is one half of that, so it must be B.

    14. We already determined this was D.

    15. We already determined this was C.

    16. This one must be 90 degrees.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    A riddle wrapped in an enigma
    masters's Avatar
    Joined
    Jan 2008
    From
    Big Stone Gap, Virginia
    Posts
    2,551
    Thanks
    11
    Awards
    1
    Hello dgen,

    In question 13, the diagonals of a rectangle bisect each other, so it's pretty obvious what AE is.

    In question 14, the angles at the corners measure 90 degrees. So the adjacent angle to 55 degrees must be 35 degrees. The supplementary angle to 70 degrees is 110 degrees, so you have a triangle with angles 35, 110 and you can figure out the third. (gotta total 180, you know)''

    In question 15, triangle AED is isosceles with a vertex angle of 70 degrees. That leaves 110 degrees to be divided equally among the base angles.

    In question 16, a rectangle has 4 right angles.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. 4 more math questions
    Posted in the Geometry Forum
    Replies: 2
    Last Post: January 25th 2009, 05:41 AM
  2. Math Questions 7
    Posted in the Algebra Forum
    Replies: 1
    Last Post: December 17th 2008, 02:45 PM
  3. Math Questions 6
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: December 17th 2008, 12:52 PM
  4. Help with math questions!!!!!!!!!
    Posted in the Statistics Forum
    Replies: 5
    Last Post: August 6th 2008, 03:32 AM
  5. need help with some math questions
    Posted in the Algebra Forum
    Replies: 6
    Last Post: October 7th 2007, 03:01 PM

Search Tags


/mathhelpforum @mathhelpforum