'the angles A, B, c and D of a quadrilateral ABCD in that order are in the ratio 5:7:7:ll. The measure of tilgle C is I
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Given:
A:B:C:D= 5:7:7:11
Let the angles be x
So we get
A:B:C:D= 5x:7x:7x:11x
So,
A =5x
B =7x
C=7x
D=11x
A+B+C+D= 360 degrees
5x+7x+7x+11x=360 degrees
30x= 360 degrees
x=360 degrees /30
x=12 degrees.
Measure of angle C is 7x = 7*12 degrees = 84 degees
hope this helps you...
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