What type of angle is ?
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What type of angle is ?
Remember that an acute angle is smaller than 90 degrees, an obtuse angle is larger than 90 degrees, and a straight angle equals 180 degrees.
Since the lines are perpendicular to each other, the marked angles are right angles each equal to 90 degrees.
Straight
Identify the angle shown in the figure below?
Look for the small square symbol in the corner of the angle! This symbol always marks a right angle. Also, perpendicular lines create four identical right angles at their intersection.
A right angle measures exactly 90° and looks like a square corner. A straight angle measures 180° and forms a straight line. Think: right = corner, straight = line!
Yes! When two lines are perpendicular, all four angles formed are right angles measuring exactly 90°. This is always true for perpendicular lines.
Acute angles are less than 90°, and obtuse angles are greater than 90°. Since the diagram shows perpendicular lines with square symbols, α measures exactly 90°, making it a right angle.
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