Question

explain this please.in 9th cbse

Answer 1

OA=OB
Because as we know tangent is a straight line they r radius from there.
AM=BM as they r divided by a mid point.
the third answer is by SSS postulate
the fourth answer is as AB is a straight line and M is a mid point therefore they r 90°.

hope this helps...
pls mark it as the brainliest...

Answer 2

IN TRIANGLE OAM AND OBM,
OM=OM (COMMON)
ANGLE AMO=ANGLE BMO (BECAUSE ANGLE A=ANGLE B AS WELL AS ANGLE AOM=ANGLE BOM AS IT IS A RULE THAT IF 2 SIDE OF TRIANGLE ARE EQUAL THEN ANGLES ARE ALSO EQUAL.) 
AM=BM (AS M IS CENTRE POINT OF AB)
SO TRIANGLE OAM AND OBM ARE EQUAL BY SAS. 
AM=BM (BY CPCT)