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Answer each question that follows. Draw
a diagram or sketch if you feel that it would help your answer to
be more accurate or quicker. Click Continue after you've selected
your answer. |
This question is testing two basic geometric rules 1) the interior angles
of a triangle equal 180 degrees and 2) perpendicular lines intersect at
90 degree angles (right angles). If upon reading this you realized immediately
that since the three streets form a triangle and two of the angles are
given (20 and 90 degrees), you could calculate the remaining angle without
a sketch:
The internal angles of a triangle always add to 180, so the third angle
must be 180 – 90 – 20 = 70 degrees.
Most questions are like this one in that some people will find a sketch
useful while others won't bother. If you did draw a sketch you probably
found that it took you a few seconds longer to do the problem, but those
seconds are well worth it if the sketch helped you find the correct answer!
This is especially true on early problems.
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Video Lessons and 10 Fully Explained Grand Tests
Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.