Math 2Y

Trig ratio- ratio of the lengths of two sides of a right Δ Always round to four decimal places

Sine (sin) sin Cosine (cos)cos Tangent (tan)tan

SOHCAHTOA inisinis p ppoverppover ypotypot osisosis djoverdjover ypotypot anisanis p ppoverppover djdj

A B A B Ca b c

A sin A= 12/13 =.9231 cos A= 5/13 =.3846 tan A= 12/5 = 2.4 B sin B= 5/13 =.3846 cos B= 12/13 =.9231 tan B= 5/12 =.4167 C A B

30° 60° 1 2 A B C sin A = ½ or.5 sin 30 =.5 3

45° A B C 1 1 sin 45 o =

Use your textbook… pg. 159 #1-3 pg. 168 #1-6 (Be sure to read the directions for each section!)