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How many degrees are there in a right angle?
A. 45 degrees
B. 90 degrees
C. 180 degrees
D. 360 degrees
Correct Answer Is Option = 90 degrees
Notes / Explanation
There are ninety degrees in a right angle, and the right angle is one of the most important and frequently encountered angles in the branch of mathematics that deals with shapes, known as geometry, as well as in everyday life. An angle is a measure of the amount of turning between two lines or directions that meet at a point, and angles are measured in units called degrees. A right angle is the angle that is formed when one line is exactly upright or perpendicular to another, so that the two lines meet to form a perfect corner, like the corner of a square or a rectangle, and this angle measures exactly ninety degrees. The right angle is of special importance because it appears everywhere in the world around us and in the shapes used in construction, design and measurement. The corners of squares, rectangles, books, doors, windows, walls and countless other objects are right angles, and the idea of one line being perpendicular to another, meeting it at a right angle, is fundamental in building, engineering and design, where it is essential that walls stand upright and that structures are square and true. The right angle also serves as a convenient reference for measuring and describing other angles. An angle smaller than a right angle, that is less than ninety degrees, is called an acute angle, while an angle larger than a right angle but less than a straight line, that is between ninety and one hundred and eighty degrees, is called an obtuse angle. A straight line represents an angle of one hundred and eighty degrees, which is equal to two right angles, and a complete turn all the way around represents an angle of three hundred and sixty degrees, which is equal to four right angles. The right angle is thus a basic building block in the understanding and measurement of angles. Instruments such as the set square are designed around the right angle and are used to draw and check right angles in technical drawing and construction. The right angle is one of the most important concepts in geometry. For PPSC and other competitive examinations, the key points to remember are that there are ninety degrees in a right angle, that a right angle is formed when one line is perpendicular to another, as in the corner of a square, that an angle smaller than a right angle is called acute and one larger is called obtuse, and that a straight line is equal to two right angles and a complete turn to four right angles.
