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You use the law of Pythagoras: a2 + b2 = c2, where a and be are the sides adjacent to the right angle, and c is the side opposite. Replace the two sides that you know, and solve for the third one.

Pythagoras: hypotenuse squared = sum of squares of other two sides.

If you know two of the sides you can calculate the third as above.

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Q: How do you find the missing length of a right angle triangle?
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Related questions

What do you do in trigonometry?

usually its used to find a missing angle or length of a right triangle. Of course there is more to trigonometry. any way you can use sine, cosine, and tangent, to fine the missing angle or length


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The sine function is used in trigonometric calculations when attempting to find missing side lengths of a right triangle. The sine of an angle in a triangle is equal to the length of the side opposite of that angle divided by the length of the hypotenuse of the triangle. Using this fact you can calculate the length of the hypotenuse if you know an angle measure and the length of one leg of the triangle. You can also calculate the length of a leg of the triangle if you know an angle measure and the length of the hypotenuse.


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It can be any length; a right angle triangle just needs to include a right angle somewhere. But length has nothing to do with whether it is a right angle or not.


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By using Pythagoras' theorem for a right angle triangle.


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The missing side of a right triangle is called the hypotenuse. This side is opposite the right angle and is the longest side of the triangle.


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