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If one side of a triangle is produced, the exterior angle is equal to the sum of the two interior and opposite, angles; and the three interior angles of every triangle are equal to two right angles.

Elements of Geometry, and Plane and Spherical Trigonometry: With Numerous ... - Σελίδα 29
των Horatio Nelson Robinson - 1865 - 444 σελίδες
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University College, Galway - 1900 - 414 σελίδες

...2«; (a;2 - 4t/!), 3y (x* + xy - 2y2), and a? - xy - ltf. 6. Solve the equations — 7. Prove that if any side of a triangle is produced, the exterior angle is greater than either of the interior angles of the triangle to which it is not adjacent. 8. Show that...

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