Posted by **Twg** on Wednesday, August 19, 2009 at 5:35pm.

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

- MATH Prob. -
**Ms. Sue**, Wednesday, August 19, 2009 at 5:38pm
See if you can figure it out after studying this site.

http://www.mathsrevision.net/gcse/pages.php?page=17

- MATH Prob. -
**Reiny**, Wednesday, August 19, 2009 at 5:40pm
All 4 of them have to add up to 360º

so far you have 3x87 or 261º

So how big is the fourth angle ?

- MATH Prob. -
**kiria**, Wednesday, April 3, 2013 at 5:47pm
If a quadrilateral has two 75 angles and 110 angles what measure is remaining angle

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