Triganometry

Question 1

What is the equation for Sin?

Answer 1

Sin feta = opposite / hypotenuse

Question 2

What is the equation for Cos?

Answer 2

Cos feta + adjacent / hypotenuse

Question 3

What is the equation for Tan?

Answer 3

Tan feta + opposite / adjacent

Question 4

What’s the mnemonic for reminding sin, cos and tan?

Answer 4

SOHCAHTOA

Question 5

|.  \
           |.        \
100m |.              \
           |.                    \
           |\_\_\_\_150m\_\_\_\_\_\_\

Work out the angle of depression

Answer 5

Tan feta = Opposite / adjacent = 150/100 = 1.5
Tan -1 (150/100) = feta = 56.3
[Calculator entry: tan -1 (150/100

Answer: 56.3

Question 6

When finding an angle when using trigonometry what do you use?

Answer 6

Sin-1 / cos-1 / tan-1

Question 7

|.  \
           |.        \
        a |.               \
           |.                     \
           |\_\_\_\_15m  \_\_\_(50*\

Work out side a

Answer 7

Tan feta = opposite / adjacent
Tan 50 = a/15
Rearrange

Calculator : tan (50) x 15

A = 17.9

Question 8

What is cos 60*

Answer 8

1/2

Question 9

What is tan 60*

Answer 9

Square root of a third

Question 10

What is sin 60*?

Answer 10

Square root of 3/2

Question 11

What is cos 45*?

Answer 11

1/ square root of 2

Question 12

What is sin 45*?

Answer 12

1/ square root of 2

Question 13

What is tan 45*?

Answer 13

1

Question 14

What shape does the angle of elevation form?

Answer 14

A triangle

Question 15

The top of the bride is point A, the bottom of the bridge is point B, a point in the middle of the road is C. What is the angle of elevation between the bride and the road?

Answer 15

The distance between point A and point C