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Answer:
(A) is linear pair .
Step-by-step explanation:
linear pair is a pair of adjacent angles formed when two lines intersect.
The two angles of a linear pair are always supplementary , which means their measures add up to 180° .
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Step-by-step explanation:
a- 1=acute angle, 2= obtuse angle
b- both are right angle
c- both are acute angle
d- 1=obtuse ang. 2= acute ang.
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