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The trigonometric ratios, as in:

sin = opposite/hypotenuse

cos = adjacent/hypotenuse

tan = opposite/adjacent = sin/cos

cannot not still be used as there is no hypotenuse.

However, other trigonometric formulae can still be used:

for example in a triangle where side a is opposite angle A, etc, the sine rule:

sin A/a = sin B/b = sin C/c = 1/2R

or the cosine rule:

a2 = b2 + c2 - 2 b c cos A

(which becomes Pythagoras when angle A is a right angle since COS 90o = 0) are always valid.

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Q: Can you use trig if there is no right angle?
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How do you know the angle without using a calculator?

To find an angle without using a calculator, you will need to use a trig identity. Determine which angle it is and use its corresponding trig identity.


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How do you find an angle of a right-angle triangle when you have all the lengths - using trigonometry?

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Related questions

How do you know the angle without using a calculator?

To find an angle without using a calculator, you will need to use a trig identity. Determine which angle it is and use its corresponding trig identity.


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You have to use trig. If the base angle is a and base b, the height is b tan(a).


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