Exact trig values

Question 1

sin30

Answer 1

1/2

Question 2

sin60

Answer 2

√3/2

Question 3

sin45

Answer 3

1/√2

Question 4

sin0

Answer 4

0

Question 5

sin90

Answer 5

1

Question 6

cos30

Answer 6

√3/2

Question 7

cos60

Answer 7

1/2

Question 8

cos45

Answer 8

1/√2

Question 9

cos0

Answer 9

1

Question 10

cos90

Answer 10

0

Question 11

tan30

Answer 11

1/√3

Question 12

tan60

Answer 12

√3

Question 13

tan45

Answer 13

1

Question 14

tan0

Answer 14

0

Question 15

what is the sin rule and what do you need to have to use it?

Answer 15

a/sinA = b/sinB = c/sinC
you can flip this over depending on whether you want to find an angle or a side
to use this you must have 2 angles and a side or 2 sides and an angle

Question 16

what is the normal cosine rule and what do you need to have to use it?

Answer 16

a² = b² + c² - 2bc cosA

you need to sides and the third sides angle and it is used to find a side

Question 17

what is the cosine rule for finding an angle ?

Answer 17

cosA = b² + c² -a² all over 2bc

you need all three sides to use this and it allows you to find an angle

Question 18

what are the two ways to find an area of a triangle?

Answer 18

1/2 x base x height

1/2 x ab x sin C

Question 19

what trig rule would you use when you have two angles given and any side?

Answer 19

sin rule:

a/sinA = b/sinB = c/sinC

Question 20

what trig rule would you use when you have two sides given plus an angle not enclosed by them?

Answer 20

sin rule:

a/sinA = b/sinB = c/sinC

Question 21

what trig rule would you use when you have two sides plus the angle enclosed by them?

Answer 21

cosine rule:

a² = b² + c² -2bc cosA

Question 22

what trig rule would you use when you have all three sides given but no angle?

Answer 22

cosA = b² + c² - a² all over 2bc