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secondary 3 | A Maths
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Help Valecia Chia! Anyone can contribute an answer, even non-tutors.
not sure how to do bii
Date Posted: 4 years ago
Views: 185
The greatest angle of elevation occurs because you are looking at a point as close to you as possible. The closer you are to a tower, the more you have to face upwards to see the top of the tower.
You will need to find out the perpendicular distance from C to the line DB which you have labelled as "o". Let E be the point on the line DB in which CE is perpendicular to DB. So you are trying to find length CE.
From there, you ccan draw a separate triangle involving C, E and T, with length CE present (you just found it) and CT given. We can do basic toa cah soh here, because vertical things are always perpendicular to horizontal grounds.
You will need to find out the perpendicular distance from C to the line DB which you have labelled as "o". Let E be the point on the line DB in which CE is perpendicular to DB. So you are trying to find length CE.
From there, you ccan draw a separate triangle involving C, E and T, with length CE present (you just found it) and CT given. We can do basic toa cah soh here, because vertical things are always perpendicular to horizontal grounds.
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