Law of Sines and Law of Cosines — a Deeper Look

Question 1

Just as you saw used to create an equation for c2, use to create an equation for a2. Solve this equation for h2.

Revolt · Accepted Answer

h2 = a2 - x2

Question 2

Replace your expression for h2 in c2=h2+b2-2bx+x2.

Revolt · Accepted Answer

C2 = a2 - x2 + b2 - 2bx + x2

Question 3

If all of the side lengths of a triangle had a length of 1, what would the simplified law of sines equation be?

Revolt · Accepted Answer

sin A = sin B = sin C

Question 4

Which of the following did you do? Check all of the boxes that apply.

Revolt · Accepted Answer

I substituted 1 for a, b, and c.; I flipped or cross-multiplied to remove the fractions.; I got sin A = sin B = sin C.

Question 5

After starting with a non-right triangle, you had to construct the .

Revolt · Accepted Answer

altitude

Question 6

Two trains leave a station on different tracks. The tracks make an angle of 115° with the station as a vertex. The first train travels 200 kilometers and makes its first stop in Pocomoc, while the second train travels 350 kilometers and makes it first stop in Easton. How far apart are the trains when both are at their first stop? Round the answer to the nearest tenth.

Revolt · Accepted Answer

470.8 km

Question 7

What type of triangles did you have to construct to start the proof?

Revolt · Accepted Answer

right triangles

Question 8

After forming two right triangles, which right triangle theorem did you have to use twice to solve for side lengths that were not in the final equation?

Revolt · Accepted Answer

the Pythagorean theorem

Question 9

What does the common side length (h) in each of the sine equations represent in ?ABC?

Revolt · Accepted Answer

the altitude

Law of Sines and Law of Cosines — a Deeper Look Answers

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