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Answer:

The angle measures 36

Step-by-step explanation:

180 - (87 + 57)

180 - 144 = 36

Answer:

x = 36

Step-by-step explanation:

A triangle is always a 180 degree angle, so add up all of the angles and subtract it to 180

57 + 87 = 144

180 - 144 = 36

x = 36