Warm-up:Find the missing sides of the triangles.

Expanding with Special Triangles:

8.3-8.4 Trigonometric Ratios

Objective: Use the sine, cosine, and tangent ratios to find missing sides of a right triangle.

Standard: Geometry 19.0

The Three Ratios:

ASine Ratio- compares ______ to ______

Cosine Ratio- compares ______ to ______

Tangent Ratio- compares ______ to _______

Abbreviations: sine = _____ cosine = _____ tangent = _____

Here's how to remember…

A

Writing RatiosEx. 1) Find the following trigonometry ratios.a) sin A =

b) cos E =

c) cos C =

d) tan A =

e) tan D =

Assignment:

#8 SOH-CAH-TOA Ratios WS

Finding Missing SidesEx. 2) Solve for x.

35°

20x

Finding Missing SidesEx. 3) Solve for x.

42°

9

x

Finding Missing SidesEx. 4) Solve for x.

73°18 x

Finding AnglesHow can we find the angle if we have the sides?

Finding Missing AnglesEx. 5) Solve for x.

x°

18

31

Finding Missing AnglesEx. 6) Solve for x.

x°

8

14

Assignment:

#9 8.3 and 8.4 WS (Workbook p. 401, 403)Skip 10-12 on 8.3