Post on 10-Feb-2016
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Good Morning, Precalculus!To prepare for class:1. Please find your DO NOW sheet and start today's DO NOW!
Do Now:
1) Check to make sure your calculator is in degree mode [it is if sin(30) = 0.5]
2) Solve the proportion by cross-multiplying and using your calculator:
Do Now:
1) Check to make sure your calculator is in degree mode [it is if sin(30) = 0.5]
2) Solve the proportion by cross-multiplying and using your calculator:
Upcoming Assignments
Due Thursday, 3/14:Half-sheet of practice problems
Today's Objective
Unit 10, Objective 1: I will be able to use the Law of Sines and the Law of Cosines to solve for missing sides
and angles in triangles.
Section 5-6, pgs. 313-318Section 5-8, pgs.327-332
Today's Agenda:1. Do Now2. Today's Objective3. The Law of Sines4. The Law of Cosines5. Practicing with Whiteboards
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
54o
xo114o
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
13x
12
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
x3
4
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
x51o
15
HYPOTENUSE
OPPOSITE
ADJA
CENT
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
x51o12
HYPOTENUSE
OPPOSITE
ADJA
CENT
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1 x
51o
15
HYPOTENUSE
OPPOSITE
ADJA
CENT
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
25xo
16
HYPOTENUSE
OPPOSITE
ADJA
CENT
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
26xo10
HYPOTENUSE
OPPOSITE
ADJA
CENT
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
xo18
24
HYPOTENUSE
OPPOSITE
ADJA
CENT
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
xo
38o
16
26?
1) Triangle Angle Sum Theorem (angles add to 180 deg.)2) Pythagorean Thm. a2 + b2 = c23) Sin4) Cos5) Tan6) Sin-17) Cos-18) Tan-1
120o
48o
x
?24
The Law of Sines
The Law of Cosines
9
Practicing with Whiteboards
580
6
x
15
Law of Sines? Law of Cosines? Neither?
Law of Sines? Law of Cosines? Neither?
9
x
9
Law of Sines? Law of Cosines? Neither?
Law of Sines? Law of Cosines? Neither?
1340
Law of Sines? Law of Cosines? Neither?
Law of Sines? Law of Cosines? Neither?