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October 24, 2014

October 24, 2014

Posted by **Reuben49** on Thursday, July 28, 2011 at 7:37am.

- Maths -
**Reiny**, Thursday, July 28, 2011 at 8:51amI made a sketch, drew some verticals at Q , P and R to get the bearings entered and found angle P = 125°

so use the cosine law:

QR^2 = 50^2 + 90^2 - 2(50)(90)cos125°

...

....

QR = 125.547... or 126 to the nearest km

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