It depends on what measure is missing.
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Add the 2 sides together then subtract the sum from 180˚. Here is an example. 50˚ + 50˚= 100˚ 180˚− 100˚ = 80˚ ←Your answer
An acute triangle
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the area referrers to the length and circumference of the triangle it self. The measurement matters to find the acute angle it self as a angle not a triangle
3 names of where you would find an acute angle is: Triangle, cone and a star.