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This geometry worksheet helps students practice finding unknown angles using the Triangle Sum and Exterior Angle Theorems.

Math worksheet featuring 12 problems on finding x using triangle sum and exterior angle theorems.

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1) x = 75
2) x = 63
3) x = 20
4) x = 55
5) x = 23
6) x = 13
7) x = 85
8) x = 30
9) x = 27
10) x = 15
11) x = 60
12) x = 24

Parent Tip: Review the logic above to help your child master the concept of triangle angle sum worksheet.

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Worksheet Triangle Sum And Exterior Angle Theorem Worksheet