MATH Prob.
posted by Twg .
Three angles of a quadrilateral each measures 87*(degrees)..what is the measure of the fourth angle??

See if you can figure it out after studying this site.
http://www.mathsrevision.net/gcse/pages.php?page=17 
All 4 of them have to add up to 360º
so far you have 3x87 or 261º
So how big is the fourth angle ? 
If a quadrilateral has two 75 angles and 110 angles what measure is remaining angle

99degree