Which angle is formed outside a triangle when one side is extended?

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Prepare for your Leaving Certificate Mathematics exam with a comprehensive practice test featuring key definitions. Use flashcards, multiple choice questions, and detailed explanations to ensure success and mastery of fundamental math concepts.

Multiple Choice

Which angle is formed outside a triangle when one side is extended?

Explanation:
When you extend one side of a triangle, the angle that appears outside the triangle is called an exterior angle. It’s formed by the extended line and the side of the triangle that meets it, sitting outside the figure. This is different from an interior angle, which lies inside the triangle; a vertical angle appears opposite at the intersection of two lines; and an adjacent angle shares a side with another angle. So the outside angle created by extending a side is specifically the exterior angle.

When you extend one side of a triangle, the angle that appears outside the triangle is called an exterior angle. It’s formed by the extended line and the side of the triangle that meets it, sitting outside the figure. This is different from an interior angle, which lies inside the triangle; a vertical angle appears opposite at the intersection of two lines; and an adjacent angle shares a side with another angle. So the outside angle created by extending a side is specifically the exterior angle.

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