Results 1 to 2 of 2

Math Help - [SOLVED] Perimeter of an isosceles triangle

  1. #1
    Member
    Joined
    Sep 2008
    Posts
    222

    [SOLVED] Perimeter of an isosceles triangle

    Hey guys,

    This is on the Barrons SAT Math II Book page 21 #44

    The vertex angel of an isosceles triangle is 35 degrees. The length of the base is 10 cm. How many cms are in the perimeter?

    How do you do this problem? THanks in advance
    Follow Math Help Forum on Facebook and Google+

  2. #2
    A riddle wrapped in an enigma
    masters's Avatar
    Joined
    Jan 2008
    From
    Big Stone Gap, Virginia
    Posts
    2,551
    Thanks
    12
    Awards
    1
    Quote Originally Posted by fabxx View Post
    Hey guys,

    This is on the Barrons SAT Math II Book page 21 #44

    The vertex angel of an isosceles triangle is 35 degrees. The length of the base is 10 cm. How many cms are in the perimeter?

    How do you do this problem? THanks in advance
    Drop the perpendicular from the vertex angle to the base, bisecting the base and the vertex angle.

    Each base angle = 72.5 degrees \frac{180-35}{2}

    Now you have two right triangles and you know their angles and one side. Use trig to find the hypotenuse.
    Attached Thumbnails Attached Thumbnails [SOLVED] Perimeter of an isosceles triangle-tri.bmp  
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Isosceles triangle of fixed perimeter P
    Posted in the Geometry Forum
    Replies: 4
    Last Post: January 3rd 2010, 08:17 AM
  2. Isosceles Triangle ABC
    Posted in the Geometry Forum
    Replies: 1
    Last Post: December 22nd 2009, 08:55 AM
  3. Replies: 27
    Last Post: April 27th 2008, 11:36 AM
  4. Replies: 1
    Last Post: March 29th 2008, 02:35 PM
  5. Perimeter of isosceles triangle
    Posted in the Geometry Forum
    Replies: 1
    Last Post: February 2nd 2008, 11:41 PM

Search Tags


/mathhelpforum @mathhelpforum