Processing Math: Done
Solution 4.2:7
From Förberedande kurs i matematik 1
If extend the line
The information in the exercise can be summarized by considering the two triangles
100+y
tan30
=
100+y
1
3
tan45
=y
1
where
The second relation above gives that
100+x
1
3
Multiplying both sides by
3
3x=100+x
moving all the x-terms to the left-hand side gives
3−1
x=100
The answer is
3−1 m
136.6 m