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2) yes. If the some of two adjacent angles are 180 then they form a linear pair.
3) The first 5 prime numbers are- 2,3,5,7,and 11.
Mean = sum of observations/number of observations.
=(2+3+5+7+11)/5
= 18/5
= 3.6
4) Angles-
a=p
b=r
c=q
Sides-
ab=pr
bc=rq
ca=qp
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