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If you have the lengths of all three sides than

ÃA = 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.

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

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The study is called trigonometry.

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

(black/red=squares) X 83

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)

It depends on what measure is missing.

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

It made finding the missing side of a right triangle easier

The study is called trigonometry.

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

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

Add all angles together and minus from 360 degrees

(black/red=squares) X 83

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

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)

No.

The Bermuda Triangle.

It depends on what measure is missing.