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Worksheet for calculating the missing angle in a triangle using the angle sum property.

A worksheet titled "Finding the Angle Sum of a Triangle" with six triangles, each showing two angles and a missing angle to be calculated, with the first example solved as 180° - 75° - 75° = 30°.

A worksheet titled "Finding the Angle Sum of a Triangle" with six triangles, each showing two angles and a missing angle to be calculated, with the first example solved as 180° - 75° - 75° = 30°.

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