Interactive macro-enabled MS-Excel spreadsheet. Contents: Write & solve equations to find angles in parallel & transversal lines. Write & solve equations to find angles in scalene triangles. Write & solve equations to find angles in isosceles triangles. Write & solve equations to find angles in right-angled triangles. Write & solve equations to find angles in irregular quadrilaterals. Write & solve equations to find angles in asymmetrical trapezia. Write & solve equations to find angles in isosceles trapezia. Write & solve equations to find angles in deltas or arrowheads. Write & solve equations to find angles in kites. Write & solve equations to find angles in parallelograms. Write & solve equations to find angles in three conjoined triangles.
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