1. RIGHT ANGLED TRIANGLES
HYPOTHENUSE
HYPOTHENUSE
OPPOSITE
ADJACENT
900 A
900
ADJACENT
OPPOSITE

2. Silly Old Harry Caught A Herring Trawling Off America
Sin , Tan , Cos. Formulae
Silly Old Harry
Caught A Herring
Trawling Off America

3. THE ANGLE OF ELEVATION AND DEPRESSION
(a) Angle of depression = Angle looking down
(b) Angle of elevation = Angle looking up
depression
elevation

4. QUESTIONS ON RIGHT ANGLED TRIANGLES
Example 1
A plane takes of at an angle of 200 to the level ground. After flying
for 100m how high is it off the ground.
100m
height
900
200

5. 100m
HYP
opp
height
900
200
In this we are given the Hyp. And we are looking for the Opp
So we use the Sin Formula

6. 14m
10m

7. 10m 8m

8. Note: If given ratio always draw right angled triangle
Adj = 5
Hyp = 13 x

10. STEP 1. With set square construct a right angle
STEP 2 Mark in the letter A along the bottom line
STEP 3 Make this opposite line 2 units with a compass
STEP 4 From this point on the vertical line measure a distance
of 5 units to the bottom line. ( this is the Hyp.) 5
opp 2 A