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maths > trigonometry > Flashcards

trigonometry Flashcards

1
Q

what is sin0°

A

0

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2
Q

what is cos0°

A

1

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3
Q

what is tan0°

A

0

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4
Q

what is sin30°

A

1/2

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5
Q

what is cos30°

A

(root 3)/2

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6
Q

what’s tan30°

A

(root3)/3 or 1/root3

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7
Q

what is sin60°

A

root3/2

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8
Q

what is cos60°

A

1/2

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9
Q

what is tan60°

A

root 3

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10
Q

what is sin45°

A

1/(root2) or root2/2

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11
Q

what is cos45°

A

1/root2 or root2/2

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12
Q

what is tan45°

A

1

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13
Q

what is sin90°

A

1

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14
Q

what is cos90°

A

0

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15
Q

what is tan90°

A

undefined

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16
Q

why is tan90° undefined?

A

because it is 1/0 and you can’t divide by 0

16
Q

why is tan90° undefined?

A

because it is 1/0 and you can’t divide by 0

17
Q

what is the sine rule

A

a/sinA = b/sinB

18
Q

what is the cosine rule?

A

a^2 = b^2 + c^2 - 2bc cosA

19
Q

what is the cosine rule rearranged for cosA?

A

cosA = b^2 +c^2 - a^2 / 2bc

20
Q

what can the cosine rule be used to calculate?

A
  1. a side when two sides and the angle in between them are known
  2. an angle when all three sides are known
21
Q

what can the sine rule be used to calculate?

A
  1. a side when two angles and an opposite side are known

2. an angle when two sides and an opposite angle are known

22
Q

what formula can be used to calculate the area of any triangle?

A

(1/2)absinC

23
Q

What is ella

A

The best

24
Q

What is 1+2

A

3! Well done

maths (3 decks)

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