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KINDS OF ANGLES

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☼ KINDS OF ANGLES :

■ Acute angle : An angle which is greater than a zero angle but less than a right angle is called an acute angle.

An angle is generally denoted by $\theta$ , and here 0⁰ < $\theta$ < 90⁰

■ Right angle : A right angle is an angle whose measure is 90⁰.

An angle is generally denoted by , and here $\theta$ = 90⁰

■ Obtuse angle : An angle which is greater than right angle but less than a straight angle is called an obtuse angle.

An angle is generally denoted by $\theta$ , and here

90⁰ < $\theta$ < 180⁰

■ Straight angle : A straight angle is an angle whose measure is 180.

An angle is generally denoted by , $\theta$ and here

$\theta$ = 180⁰

■ Reflex angle : An angle which is greater than 180^o but less than 360⁰ is called a reflex angle.

An angle is generally denoted by $\theta$ , and here

180⁰ < $\theta$ < 360⁰

■ Complete angle : A complete angle is an angle whose measure is 360⁰.

An angle is generally denoted by $\theta$ , and here

$\theta$ = 360⁰

◙ Zero angle = 0⁰,

◙ 1 right angle = 90⁰,

◙ 1 straight angle = 2 right angles = 180⁰,

◙ 1 complete angle = 2 straight angles = 4 right angles = 360⁰.