Vertical Angles Theorem - Two angles across from each other when lines intersect are equal., Triangle Sum Theorem - The total of the three angles in a triangle is 180°., Pythagorean Theorem - In a right triangle, a² + b² = c²., Exterior Angle Theorem - An exterior angle of a triangle equals the sum of the two non-adjacent interior angles., Isosceles Triangle Theorem - If two sides of a triangle are equal, then their opposite angles are equal.,

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