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www.google.ie http://www.cimt.org.uk/projects/mepres/step-up/sect4/index.htm https://www.youtube.com/watch?v=I8LI7wPSvNI

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All the angles in this Triangle added to 179.9897*, is close enough to 180*.

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All the angles in this Triangle added to 179.9897*, is close enough to 180*.

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2. By using angle A, we can sub it in to the sine rule to find the other remaining angles

Finding Angle B

· 44/Sin(59.625) = 26/Sin(B)

· 44(SinB) = 22.431

· SinB = 0.5097

· Sin-1(0.5097) = B = 30.6503*

Finding Angle C

· 44/Sin(59.625) = 51/Sin(C)

· 44(SinC) = 43.9995

· SinC = 0.9999875

· Sin-1(0.9999875) = 89.7144

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Find the missing angles

1. We find one of angles. Let’s choose “A”.

Cos(A) = [26(26) + 51(51) - 44(44)] /2(26)(51) = 0.5056

Cos-1(0.5056) = A = 59.625*

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· We can’t use Pythagoras; it’s not a right angle triangle.

· We can’t use Sin, Cos or Tan; it’s not a right angle triangle

· We can’t use the Sine Rule; we aren’t given the angle and the side opposite

We will be using the Cosine Rule.

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We need to find the 3 angles using trigonometry.

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We know that the side values are:
· [b] = 26m
· [a] = 44m
· [c] = 51m

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Applying Trigonometry to find the missing angles of this hill

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Applying Trigonometry to find the missing angles of this hill

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This is a branch of maths dealing with the relations of the sides and angle of triangle and with the relative functions of any angles. (Basically calculation with triangles).