Need help in geometry question

Question

if i knw the third interior angle then i could find x and find the measure , what to do please help

Answer 1

The exterior angle is equal to the sum of the two opposite interior angles so:

4x+12=2x-15+3x-17

12+15+17=5x-4x=x and x=44.

Now substitute x to find all the angles: 188, 73, 115.

Whoops, we can’t have an angle bigger than 188, so the situation is impossible.

Comments

thank you so much sir