Question

Which is the best estimate of the measure of this angle?

Answer 1

A straight line is 180° and this is less than that but it’s more than 90°, 105° is close to 90 and this is a bit bigger so your best estimate is

B.) 180°

Answer 2

B. 150

105 is too small/close of an angle to a right angle
60 is an acute angle
and 210 is to large of an angle, it would be larger than a straight line