definition

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Jul

Triangle

☼ TRIANGLE : A triangle is a plane figure bounded by three straight lines ( called sides of a triangle ). A vertex of a triangle is a point where two straight lines meet. Thus, in a triangle there are three vertices. The symbol …

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Jul

Examples of Lines and angles

(1) AB and CD are two parallel lines. Find x, y and z.

Soln. x = 70⁰ ( Vertically opposite angles. )

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Jul

Parallel Lines

☼ Parallel Lines : Two straight lines in the same plane are said to be parallel, if they do not intersect in the entire plane. We can say that distance between any two points on two parallel lines is the same.

Posted in: Parallel Lines,

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Jul

PAIRS OF ANGLES

☼ PAIRS OF ANGLES :

■ Adjacent angles : Consider two angles BAC and CAD with the same vertex A and the arm AC common to them. Two such angles with the same vertex, one arm common are called adjacent …

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Jul

KINDS OF ANGLES

☼ 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

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Jul

ANGLES

☼ ANGLES : The union of two rays having the same initial point and not lying in one line is called an angle.

Consider two rays $\overrightarrow{OA}$

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Jul

Lines and angles

☼ Undefined Terms : In geometry there are four undefined terms, namely a point, a line, a plane and a space.

But there is a certain relation in above four words given as below :

Point

Posted in: Lines and angles,

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