12. The values of trigonometric ratios can be
determined even without the use of
calculator. Just be reminded that the two
special right triangles are the triangle
30° − 60° − 90° and the isosceles 45° −
13. Output #4.__
Directions: Find the value of each variable
used in the figures. If your answer is not an
integer, express it in simplest radical form.
14.
15.
16. Ass.# 4.__ Directions: analyze the problem to find what is being asked.
1. As a hot-air balloon began to rise, the ground crew
drove 1.2 miles to an observation station. The initial
observation from that instant is the angle between the
ground and the line of sight to the balloon is 30°.
Approximately how high was the balloon at that point?
Draw the situation. Show your solution.
2. Study: a. What is the meaning of angle of elevation?
Angle of depression?
b. How do they differ from each other?
