Upload
chrystal-wright
View
224
Download
6
Tags:
Embed Size (px)
Citation preview
Geometry 8-2Trigonometric Ratios
Vocabulary A trigonometric ratio is a ratio of two
sides of a right triangle.
1st Trigonometric Ratio The sine (sin):
oppositesin
hypotenuse
Examples Write each trig ratio.
sin J
sin K
2nd Trigonometric Ratio The cosine (cos):
adjacentcos
hypotenuse
Example Write each trig ratio.
cos B
cos A
3rd Trigonometric Ratio The tangent (tan):
oppositetan
adjacent
Example Write each trig ratio.
tan A
tan B
How to Remember SOHCAHTOA
Calculator You can use the calculator to evaluate
the ratio of an angle’s measure.
Make sure the calculator is in degrees!!!
sin(22°)= cos(46°)= tan(65°)=
Using Trig Ratios Example Find the measures of x and h.
h36 in.
60º
30º
x
24 ft
Another Example Find the length of side BC.
Word Problem You and your friends decide to build a
bike ramp using a 4 ft piece of wood. You make a 45° angle with the ground because it will give you the most distance after takeoff. How high above the ground will the back wheel be when your bike goes off the ramp?