How the world was created - Mr.O's Website
Now that you know the three main trigonometric rules you will be asked to know how to apply them in different situations. Here are the steps to knowing which law to use.
First – know your rules (SOHCAHTOA)
S
O
H
C
A
H
T
O
A
Second – know what you are being asked to find and what you are given to use.
Third – know how to apply the rules
Example 1: AB = 15 and BC = 13 find angle A.
Step 1 – label your diagram
Step 2 – determine which rule (Sin/Cos/Tan) you are to use by examining which sides you are working with.
Step 3 – write out the equation
Step 4 – fill in the equation using the information in the diagram
Step 5 – solve for the unknown
Example 2: AB = 22 and angle B = 33 degrees, find AC.
Step 1 – label your diagram
Step 2 – determine which rule (Sin/Cos/Tan) you are to use by examining which sides you are working with.
Step 3 – write out the equation
Step 4 – fill in the equation using the information in the diagram
Step 5 – solve for the unknown
Example 3: AC = 15 and angle B = 33 degrees, find CB.
Step 1 – label your diagram
Step 2 – determine which rule (Sin/Cos/Tan) you are to use by examining which sides you are working with.
Step 3 – write out the equation
Step 4 – fill in the equation using the information in the diagram
Step 5 – solve for the unknown
Example 4: The two guy wires supporting a flagpole are each anchored 7m from the flagpole and form an angle of 52 degrees with the ground. What is the total length of guy wire, to the nearest metre, to support the flagpole?
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A
B
C
A
B
C
A
B
C
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