Question

2. Two angles of a polygon are right angles and every other angle is 120º. Find the number of sides of the polygon . Cannot get the formulae?? i need explanation.

Answer 1

Answer:

Let number of sides of polygon is n.

Two angles of a polygon are right angles and the remaining are 120

o

each

Sum of total angles of a polygon is = 180

o

(n−2)

n= number of sides of polygon

Now,

2×90

o

+(n−2)×120

o

=180

o

(n−2)

180

o

n−120

o

n=180

o

+360

o

−240

o

60

o

n=300

o

n=5

Step-by-step explanation:

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