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How many degrees are there in a complete circle?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
Correct Answer Is Option = 360 degrees
Notes / Explanation
There are three hundred and sixty degrees in a complete circle, and this is a basic and important fact in the branch of mathematics that deals with shapes and angles, known as geometry. A degree is the unit used to measure angles, which are measures of the amount of turning, and a complete turn all the way around, returning to the starting direction, is divided into three hundred and sixty equal parts, each of which is one degree, so that a full turn or a complete circle is made up of three hundred and sixty degrees. This division of the complete turn into three hundred and sixty parts is an ancient system that has been used for a very long time, and the number three hundred and sixty is convenient because it can be divided evenly in a great many ways, which makes it useful for describing fractions of a turn. Using this system, a half turn, which is the same as a straight line, is one hundred and eighty degrees, being half of three hundred and sixty; a quarter turn, which is the same as a right angle, is ninety degrees, being a quarter of three hundred and sixty; and a three-quarter turn is two hundred and seventy degrees. The measurement of angles in degrees, based on the division of the complete circle into three hundred and sixty parts, is used throughout mathematics and in many practical fields. It is used in describing directions and bearings, as in navigation, where directions are given as angles measured around the full circle; it is used in the measurement and construction of shapes and structures; it is used in the design of machines and in many other applications. The complete circle of three hundred and sixty degrees also relates to the division of other things into parts, and the number appears in various contexts. Understanding that a complete circle contains three hundred and sixty degrees, and how this relates to the right angle, the straight line and other fractions of a turn, is a basic and useful part of geometry. Questions about the number of degrees in a circle, a straight line or a right angle are common in examinations. For PPSC and other competitive examinations, the key points to remember are that there are three hundred and sixty degrees in a complete circle, that a degree is the unit used to measure angles, that a half turn or straight line is one hundred and eighty degrees and a quarter turn or right angle is ninety degrees, and that the division of the circle into three hundred and sixty degrees is an ancient and convenient system used throughout mathematics and in practical fields such as navigation.
