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Pls help me this is 7th grade (ADVANCED)

Pls help me this is 7th grade (ADVANCED)-example-1
User Quantity
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Answer: We can use equations to represent the measures of the angles described above. One equation might tell us the sum of the angles of the triangle. For example,

X°+145°=180° because there supplementary angles.

X°=35° because 180-145=35°.

User Ted Kulp
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