2 -BG
On a map, the differences in elevation are best shown using contour lines.
The highest elevation line shown on the map depends on what is the highest point - which is often the summit of a hill or mountain.
It can be shown that:height = (d tan α tan β)/(tan α - tan β)where: α is the angle closest to the objectβ is the angle further away from the objectd is the distance from the point of angle α to the point of angle βThus: height = (80 ft × tan 45° × tan 34°)/(tan 45° - tan 34°) ≈ 165.78 ft
Contour lines
side- angle- side
90
bac
perpendicular
Two sides and the included angle of one triangle must be congruent to two sides and the included angle of the other.
topographical map.
45
Apex (Angle)The apex is the pointed tip of a cone. The apex angle is the angle between the lines that define the apex, as shown to the left.