18.5 Law of Sines: *used to find the 3rd side of a triangle
*you need to know 2 angles and a side
(a.a.s or a.s.a)
a = b = c sinA sinB sinC
1
In triangle ABC, a=10, angle A=30 and angle B=50
Find b.
2
In triangle ABC, a=12, sinA=1/3 and sinC=1/4
Find c.
3
In triangle DAT, angle D =27, angle A= 105, and t = 21.
Find d to the nearest integer.
4
In right triangle ABC, angle C=90, angle A =56, and BC=8.7
Find AB to the nearest tenth.
5
Find to the nearest integer the measure of the base of an
isosceles triangle if the measure of the vertex angle is 70o
and the measure of each of the congruent sides is 15.
6
A wire that is 8.5 meters long runs in a straight line from the top of a telephone pole to a stake in the ground. If the wire makes an angle of 680 with the ground, find to the nearest tenth of a meter the height of the pole.
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Homework:
pg 834 #3, 4, 7‐11, 16, 18, 19
pg 825 #12
pg 819 #8
STUDY FOR QUIZ TOMORROW: Law of Cosines and Law of Sines
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