Trigonometry cont’d (G.8)

OBJ: SWBAT APPLY TRIG FUNCTIONS (8.3)

HW (DAY 42): WORKSHEET- ODDS

STORYBOOK: “RIGHT TRIANGLES”PEARSONSUCCESS.NET (DUE FRIDAY)

WU: WKS (1, 6, 23, 24, 26, 32, 34, 36) *HW/HW LOG/STORYBOOK AS

REFERENCE

Evaluate: cos 41, first press the “cos” button on the calculator, then type in “41” and then press enter.

So to the nearest ten-thousandths, cos 41 _____

Evaluate the following, round to the nearest ten-thousandths:▪ sin 43 __________▪ cos 84 __________▪ tan 21 __________

Examples:

A 16-foot ladder is propped against a building. The angle it forms with the ground measures 55. How far up the side of the building does the ladder reach?

A plane is one mile above sea level when it begins to climb at a constant angle of 2 for the next 70 ground miles. How far above sea level is the plane after its climb?

Example:

To find the acute angles in right triangles you have to use the inverse trigonometric functions.

This is an example of a Pythagorean Triple. Can you give at least two more examples of a Pythagorean Triple?

5 4

Example

Find the measure of each angle to the nearest tenth of a degree:

0035.2)tan( A 798.0)cos( B

Find the Missing Angle or Side

1016

x

x

16

12

17x

9.7 x24

32

1.

4.3.

2.

Remember:

Use trig ratios to find missing side lengths of right triangles

Use inverse trig functions to find angle measures