trig ratios

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9 Terms

1
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cosine rule for finding sides

a2 = b2 + c2 - 2bccosA

2
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cosine rule for finding angles

cos A = (b2 + c2 - a2) / 2bc

3
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sine rule for missing sides

a / sin A = b / sin B = c / sin C

4
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sine rule for missing angles

sin A / a = sin B / b = sin C / c

5
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area of right angled triangle

BH / 2

6
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area of non right angled triangle

½ ab sinc C

7
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what does it mean for a graph to be periodic?

it repeats after a set interval

8
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sin graph

  • goes through the origin

  • minimum value = 1, maximum value = -1

  • repeats every 360 degrees (2π)

  • crosses x axis at multiples of 180

  • minimum and maximum values at multiples of 90

<ul><li><p>goes through the origin </p></li><li><p>minimum value = 1, maximum value = -1</p></li><li><p>repeats every 360 degrees (2<span>π)</span></p></li><li><p><span>crosses x axis at multiples of 180</span></p></li><li><p><span>minimum and maximum values at multiples of 90 </span></p></li></ul><p></p>
9
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cos graph

  • goes through

  • minimum value = 1, maximum value = -1

  • repeats every 360 degrees (2π)

  • crosses x axis at multiples of 180

  • minimum and maximum values at multiples of 90

<ul><li><p>goes through </p></li><li><p>minimum value = 1, maximum value = -1</p></li><li><p>repeats every 360 degrees (2π)</p></li><li><p>crosses x axis at multiples of 180</p></li><li><p>minimum and maximum values at multiples of 90 </p></li></ul><p></p>

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