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Brilliant_brown [7]
3 years ago
9

How to find x in a triangle with exterior angles

Mathematics
1 answer:
Temka [501]3 years ago
8 0
Since RS and ST are congruent sides, angles SRT and STR will be equal. Also, angles STU (5x) and STR added together equals 180. Therefore angles STU and SRT will also equal 180. All that's left to do is set up the equation and solve. 5x - 30 + 5x = 180.
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