Which angle measures 90 degrees?

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 measures 90 degrees?

Explanation:
Angles are described by how much they open. A right angle is defined by opening exactly 90 degrees, which is the perpendicular corner formed when two lines meet at a right angle. In diagrams this is often shown with a small square in the corner, signaling that the two sides are perpendicular. This 90-degree measure is what distinguishes a right angle from the others: an acute angle opens less than 90, an obtuse angle opens more than 90 but less than 180, and a straight angle opens exactly 180 along a straight line. So the angle that measures 90 degrees is the one that forms a perfect, perpendicular corner.

Angles are described by how much they open. A right angle is defined by opening exactly 90 degrees, which is the perpendicular corner formed when two lines meet at a right angle. In diagrams this is often shown with a small square in the corner, signaling that the two sides are perpendicular. This 90-degree measure is what distinguishes a right angle from the others: an acute angle opens less than 90, an obtuse angle opens more than 90 but less than 180, and a straight angle opens exactly 180 along a straight line. So the angle that measures 90 degrees is the one that forms a perfect, perpendicular corner.

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