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MD Abid Junaid

· started a discussion

· 1 Months ago

Solution is incorrect (Question: 107876.0 )

Solution is incorrect, bcz we can not take (n-2)180 is polygon is not closed figure. it contains 5 other side also.

Question:

In a polygon, the each angle of 5 sides is 172° and the other angles are 160° each. Find the number of sides of the polygon.


Options:
A) 18
B) 23
C) 20
D) 21
Solution:

5*172 = 860

860 + (n-5)*160 = (n-2)*180

 860 + 160n - 800 = 180n - 360

420 = 20n

n = 21 sides

kanhaiya jha

· commented

· 1 Months ago

21 is correct..


5*172 = 860
860 + (n-5)*160 = (n-2)*180
860 + 160n - 800 = 180n - 360
420 = 20n
n = 21 sides
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