a steel chimney is held in position by several guy wires. two such wires are AB and AC where B, C and the base of the chimney D, are on the same level in a straight line with B and C on the left of the chimney. if angle ABC=42 degrees, ACD=67degrees and BC=32M find the height of A above D..
many thanks
With a protractor to measure the angles construct a scale diagram
and measure the height of the diagram.
On my diagram the height is 46mm, where 1mm is equivalent to 1m, so
this method for me gives an answer of 46m.
This compares with an answer of ~=46.64m from the method I gave
previously.
A larger drawing (1cm to 1m lets say) should give a extra significant digit,
and more care with the diagram might give some more accuracy (say
to +/-0.025m).
(a larger diagram would give more accuracy - also the angles could
be constructed using the trig ratios rather than a protractor if need
be).
RonL