Angles opposite one another at the intersection of two lines. They are congruent (the same size).

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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.

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Angles opposite one another at the intersection of two lines. They are congruent (the same size).

When two straight lines cross, the angles that lie opposite each other are equal. These are called vertical angles. The X formed by the intersection creates two pairs of opposite angles, and each pair has the same size regardless of how the lines cross. This equality holds for any intersecting lines, not just special setups. Adjacent angles share a side and add to 180 degrees, so they aren’t generally equal. Alternate interior and corresponding angles involve a transversal with two lines and are equal only under the parallel-line condition, not simply at the intersection itself. So the matching description is vertical angles.

Angles opposite one another at the intersection of two lines. They are congruent (the same size).

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.

Angles opposite one another at the intersection of two lines. They are congruent (the same size).

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