Precalculus Day 14.

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Presentation transcript:

Precalculus Day 14

Knight’s Charge: Two ships see a man on top of a 100 ft-cliff at angles of elevation of 30° and 45 °. How far apart are the ships from each other?

Law of Cosines DON’T MEMORIZE THIS AS THREE DIFFERENT FORMULAS…. IT’S THE SAME FORMULA, JUST “ALTERED” BASED ON WHICH SIDE/ANGLE IS UNKNOWN.

Example 1:

Example 2: Find the length of side c.

Example 3

Find the LARGEST ANGLE first! Example 4: Solve the triangle. Find the LARGEST ANGLE first!

Choosing Between Law of Sines and Law of Cosines Now solve triangles 1 and 4!

Review Game https://www.superteachertools.net/jeopardyx/jeopardy-review-game.php?gamefile=1390795953#.VNvzVebF9u6

Victory Lap Solve the triangle:

Homework