08 Triangles And Radian Measure

Question 1

What is the cosine rule?

Answer 1

a^2 = b^2 + c^2 - 2bc cos A

Question 2

What is the sine rule?

Answer 2

Question 3

What should you do with the sine rule when finding a missing angle?

Answer 3

Flip it.

Question 4

What is the equation for the area of a triangle?

Answer 4

1/2 ab sin C

Question 5

What should you do if you are finding an obtuse angle but you get an acute angle?

Answer 5

180 - (the acute angle you got)

Question 6

What is the ambiguous case?

Answer 6

When asked to find a length or a missing angle there are 2 possible answers.

Question 7

Only when do ambiguous cases arise?

Answer 7

When you are given 2 sides and the non included angle on the long side.

Question 8

What is the largest angle opposite to?

Answer 8

The longest side

Question 9

What is the smallest angle opposite?

Answer 9

The smallest side.

Question 10

How many radians is 180 degrees?

Answer 10

π radians

Question 11

How many degrees is 2π?

Answer 11

360 degrees

Question 12

How many degrees is π/2?

Answer 12

90 degrees

Question 13

What is the equation for arc length? (Radians)

Answer 13

rθ

Question 14

What is θ measured in?

Answer 14

Radians.

Question 15

What is the equation for sector area?

Answer 15

1/2 r^2 θ