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AnimeBrainly
A triangle's angles (in all) = 180 degrees

78 + 27 + x = 180

simplify:

78 + 27 + x = 180

105 + x = 180

subtract 105 from both sides

x + 105 (-105) = 180 (-105)

x = 180 - 105

x = 75° is your answer

hope this helps
nilbert
Hi there!

Since the sum of all angles in any triangle always equals 180°, we can just subtract to find x.

180 - 27 - 78
= 153 - 78
= 75

So, the value of x is 75°.

Hope this helps!