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You can find the slope of each line, and if any line in a negative reciprocal of the other, it means that the line make sure a 90 degree angle

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Find slope of AB, draw 90deg from C to AB making it perpindicular from AB, and then do negative reprisal of AB slope to find length
Path agree theromn

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Find the length of all line. If there is a negative reciprocal then it is a right triangle

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1. See if AC is perpendicular to AB by calculating their slope and negative reciprocal to see if they're equal.

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Find the slope of AB and the slope of AC and they should be opposites

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You need to find out the slope of c-b and also a-c and if they are the negative reciprocal of each other than it will form a right angle

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1. Find the slope of all the lines in the triangle and see if any of them is a negative reciprocal.
2. Find the length of all the lines then use Pythagorean Theoram.

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Find the slope of all the lines and if one slope is the negative reciprocal of a other line then it is a right triangle