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# Geo 8.3-4-notes_trig

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Introduction to the 3 trig functions.

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### Geo 8.3-4-notes_trig

1. 1. Warm-up:Find the missing sides of the triangles.
2. 2. Expanding with Special Triangles:
3. 3. 8.3-8.4 TrigonometricRatiosObjective: Use the sine, cosine, andtangent ratios to ﬁnd missing sides ofa right triangle.Standard: Geometry 19.0
4. 4. The Three Ratios:Sine Ratio- compares______ to ______ ACosine Ratio- compares______ to ______Tangent Ratio- compares______ to _______Abbreviations:sine = _____ cosine = _____ tangent = _____
5. 5. Heres how to remember… A
6. 6. Writing RatiosEx. 1) Find the following trigonometryratios. a) sin A =b) cos E =c) cos C =d) tan A =e) tan D =
7. 7. Assignment:#8 SOH-CAH-TOA RatiosWS
8. 8. Finding Missing SidesEx. 2) Solve for x. 20 x 35°
9. 9. Finding Missing SidesEx. 3) Solve for x. x 42° 9
10. 10. Finding Missing SidesEx. 4) Solve for x. 73° x 18
11. 11. Finding AnglesHow can we ﬁnd the angle if we have thesides?
12. 12. Finding Missing AnglesEx. 5) Solve for x. x° 31 18
13. 13. Finding Missing AnglesEx. 6) Solve for x. 8 x° 14
14. 14. Assignment:#9 8.3 and 8.4 WS(Workbook p. 401, 403)Skip 10-12 on 8.3