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| | Math Is Fun Forum / help !!! |
 | | The other two angles can combine with one of the angles in the inner pentagon to make a straight line. |
 | | This means that angle A is 180° - ((180° - p) + (180° - q)), which is equal to p + q - 180° (where p and q are the appropriate angles in the pentagon). |
 | | Similar reasoning can be applied to B, C, D and E, and so if we label the inner angle of the pentagon as p, q, r, s and t, then the total of A, B, C, D and E is found by 2(p+q+r+s+t) - 900°. |
| www.mathsisfun.com /forum/viewtopic.php?pid=49523 (742 words) |
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