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LearnNext Lesson Video

The distance between the endpoints of a line segment is the **length** of the line segment. The length of a line segment can be measured accurately using a **ruler and a divider**.

An angle of measure **360 ^{0}** is called a complete angle.

One quadrant = ¼ (Complete angle)

= 1/4 x 360

Two quadrants = 1/2 (Complete angle) = 1/2 x 360

Three quadrants=3/4

(Complete angle) = 3/4 x 360

An angle that measures **90 ^{0} **is called a right angle. A right angle makes

An angle that measures **180 ^{0}** is called a straight angle. A straight angle makes

An angle that measures **less than 90 ^{0}** is called an acute angle.

An angle that measures **more than 90 ^{0} and less than 180^{0}** is called an obtuse angle.

An angle that measures **more than 180 ^{0}** is called a reflex angle.

Two lines that meet each other at a single point are called intersecting lines.

Two lines that **intersect each other at right angles** are said to be perpendicular to each other.

A bisector of a line segment is a line that divides the line segment into **two equal parts**.

The perpendicular line that divides a line segment into two equal parts is called the perpendicular bisector of the line segment.

let the angle=x

then the complemet will be=(90-x)

given,x=2(90-x)

=x=180-2x

=x+2x=180

=3x=180...

Sol:

1) Let the magnitude of the angle which is equal to its supplementary angle be 'x'.

? x = (180° - x)

?...

Sol:

Ratio of complementary angles is 3:7

Let the angles be 3x and 7x.

3x + 7x = 90°

10x = 90°

x = 9...

Sol:

Measure of a right angle = 90°

One third of the right angle = 30°

Complementary angle of one third of a right a...

Supplementary angle of 100
^{o} 30'

= 180° - 100
^{o} 30'

= 79° 30'