<PRE><B>Question 972208</B>
Given:
A = 90
B = 90
C = D = E = F


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S = 180(n-2)
S = 180(6-2) ... replace n with 6
S = 180*4
S = 720


All 6 angles add up to 720 degrees


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Let x be the measure of angles C,D,E,F. The goal is to solve for x.


A+B+C+D+E+F = 720
90+90+x+x+x+x = 720
180+4x = 720
4x = 720-180
4x = 540
x = 540/4
x = 135


So the measure of angle F is 135 degrees.</PRE>