A straight angle measures 180° and looks like a straight line, therefore, it is a mathematical way of expressing a straight line. It is an angle whose arms lie in opposite directions from the vertex and they join together to form 180°. Let us learn more about the straight angle in this article. Show
Straight Angle DefinitionWhenever two rays join together they form an angle and the angle subtended by two rays in opposite directions is called a straight angle. In geometry, a straight angle is an angle whose vertex point has a value of 180 degrees. In other words, when the arms of the angle lie in the opposite direction, they form a straight angle. The arms make a straight line through the vertex. Properties of a Straight AngleThe important properties of straight angles are as follows.
Straight Angle DegreeThe degree or the measure of a straight angle is always 180º. In the conventional angle measuring system, we consider the right angle as 90º and the angle around a point to be 360º. The straight angle is made up of two right angles. Observe the figure given below to understand this fact. Drawing a Straight Angle Using a ProtractorA straight angle can be constructed easily using a protractor. Follow the steps given below to draw a straight angle using a protractor:
The following figure shows how a straight angle is constructed using these steps. Straight Angle PairA pair of angles that form a straight line is called a straight angle pair. The sum of two angles that are in a straight angle pair is always equal to 180°. They are also known as linear pairs of angles. The image shown below shows two angles a = 135° and b = 45°, which together form 180°. The straight angle pairs have the following properties in common. They have a common arm and a common vertex. In the following figure, QS is the common arm and Q is the common vertex. Straight Angles in Real LifeWe come across straight angles often in our day-to-day life. Some examples of a straight angle are given below.
All the angles given below are straight angles. They differ only in orientation. Following these, we can find many straight angles around us. Topics Related to Straight Angles
Important Notes:
FAQs on Straight AnglesWhat is a Straight Angle in Math?When two rays or arms of an angle are in opposite directions, they make a straight line. The angle formed by these two rays is 180°. This is called a straight angle. What is the Measure of a Straight Angle?A straight angle measures 180° because it is formed when two rays are joined in opposite directions. What is Half the Measure of a Straight Angle?90° is half the measure of a straight angle. It is also called a right angle. Can we say that a Straight Line is a Straight Angle?Yes, a straight line with two endpoints makes an angle of 180°. So we can consider a straight line as a straight angle. What Fraction of a Straight Angle is a Right Angle?A right angle measures 90° and a straight angle measures 180°. Therefore, a right angle is half of a straight angle. 1/2 × 180° = 90°. What is Greater than a Right Angle and Less than a Straight Angle?An angle which is greater than a right angle (90°) and less than a straight angle (180°) is called an obtuse angle. How many Right Angles are there in a Straight Angle?Since a right angle measures 90° and a straight angle measures 180°, this means that there are two right angles in a straight angle. 90° + 90° = 180° What does a Straight Angle Look Like?A straight angle looks like a straight line whose angle is 180°. The best example of a straight angle is when the hour hand of a clock is at 6 and the minute hand is at 12, the time is 6 o'clock and the hands form a straight line or a straight angle. What is an example of a straight angle?A straight angle looks like a straight line whose angle is 180°. The best example of a straight angle is when the hour hand of a clock is at 6 and the minute hand is at 12, the time is 6 o'clock and the hands form a straight line or a straight angle.
What is a straight angle called?A straight angle is 180 degrees
This is a straight angle. A straight angle changes the direction to point the opposite way. Sometimes people say "You did a complete 180 on that!" ...
What is the measure of a right angle a straight angle?(ii) The measure of a straight angle is 180°.
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