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Lines and Angles – Definitions & Properties

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Line segment : A line segment has two end points with a definite length. Ray : A ray has one end point and infinitely extends in one direction. Straight line : A straight line has neither starting nor end point and is of infinite length. Acute angle : The angle that is between 0° and 90° is an acute angle, ∠A in the figure below. Obtuse angle : The angle that is between 90° and 180° is an obtuse angle, ∠B as shown below. Right angle : The angle that is 90° is a Right angle, ∠C as shown below. Straight angle : The angle that is 180° is a straight angle, ∠AOB in the figure below. Supplementary angles : In the figure above, ∠AOC + ∠COB = ∠AOB = 180° If the sum of two angles is 180° then the angles are called supplementary angles. Two right angles always supplement each other. The pair of adjacent angles whose sum is a straight angle is called a linear pair. Complementary angles : ∠COA + ∠AOB = 90° If the sum of two angles is 90° then the two angles are ...
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What are Different Types of Engine?

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   What are Different Types of Engine?     Mechanical Engg Automobile Engg Machines What are Different Types of Engine? with (Images and PDF) By   Sazid Asad Ahmad -  March  21, 2021 null In this article you’ll learn, what are different types of engines used in the automotive industries. And also you can download the PDF file of this article at the end of it. What is an Engine? An  engine  is a machine designed to convert one form of energy into mechanical energy. Heat engines like internal combustion engines burn their fuel inside the engine cylinder. On the other side, external combustion engines are those heat engines that burn their fuel outside of the engine cylinder. These are steam engines.  The energy developed during the combustion of fuel is transmitted to steam which acts on  the piston inside the cylinder.  In  internal combustion engines , the chemical energy stored in their operation. The heat energy is conve...
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