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If you have the lengths of all three sides than

ÐA = cos-1[(b2 + c2 - a2)/2bc] where a, b and c are the lengths of the sides and A is the angle opposite side a.

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Q: What is the formula for finding a missing angle of a triangle when there are no other angles available?
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Related questions

What is the formula for finding a missing side on a congruent triangle?

It is the same length as the corresponding side on the other triangle.

What impact did the Pythagoras theorem have on society?

It made finding the missing side of a right triangle easier

What is finding all missing side lengths and angle measures of a right triangle?

The study is called trigonometry.

What is the formula of a triangle as an equation?

Depending on what you're solving for in a triangle determines which formula you're going to use. The equations (formulas) are as follows:Finding a missing side of a Right Triangle: a2 + b2 = c2a = leg1 or side1b = leg2 or side2c = HypotenuseInterior Angles of a Triangle: x + y + z = 180ºPerimeter of a Triangle: P = S1 + S2 + S3Area of a Triangle: A = ½bh OR A = (bh)/2When finding the area of something your unit of measurement is always going to be squared. Ex: 5 in2

What is the formula for finding missing lengths on a compound shape?

There is no standard formula. The answer will depend on the compound shape and also on which of the lengths (or angles) are known.

What is the formula for finding a missing angle in a quadrilateral?

Add all angles together and minus from 360 degrees

What is the formula for finding all of the missing squares in an 88 checkerboard?

(black/red=squares) X 83

How do you found 2 missing angles of a triangle?

I don't think there is a formula if you only know one angle measure. Use a protractor.

How do i find the' missing measurement on a triangle that has a base of 20 and an area of 30ft2?

The depends on what the missing measurement is. From here, I can see at leastthree missing measurements . . . the height of the triangle, and the lengths of theother two sides. The method needed in order to find the 'missing measurement'depends entirely on which one of those you're asked to find.Here's a formula that may come in handy. If not, just put it away for later.Area of a triangle = 1/2 (Base times Height)

Triangle missing square?


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The Bermuda Triangle.

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It depends on what measure is missing.