LINES AND ANGLE PPT
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F.A-2 ACTIVITY-2LINES AND ANGLES
SUBMITTED TO MRS.KRITI
SUBMITTED BY:-7)ARMAN BENIPAL8)BHARAT NANDA9)BISMANOT SINGH10)CHASHMEET SINGH11)CHIRAG SHARMA12)DIVYAM GOYAL
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INDEX• Introduction• Angles In Daily Life• Basic Terms And Definitions• Intersecting Lines And Non
Intersecting Lines• Perpendicular Lines• Angles• THEOREMS• AKNOWLEDGEMENT
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INTRODUCTION
• In math geometry the lines and angles are important tools. If any object in ideal, that is called as line and it is represented as straight curve.
• The angle is related with line that is the cross-section of two-line is create the angle and that intersection point is called as vertex. Here we see about types of line and angle in math.
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ANGLES IN DAILY LIFE
If we look around us, we will see angles everywhere.
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BASIC TERMS AND DEFINITION
RAY: A part of a line, with one endpoint, that continues without end
in one direction
LINE: A straight path extending in both directions with no endpoints
LINE SEGMENT: A part of a line that includes two points, called endpoints, and
all the points between them
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INTERSECTING LINES AND NON INTERSECTING LINES
Intersecting Lines : Lines that cross
Non Intersecting lines : Lines that never cross and are always the same distance apart
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EXAMPLES OF NON INTERSECTING LINES
• Hardwood Floor• Opposite sides of windows, desks, etc.• Parking slots in parking lot• Parallel Parking• Streets: Laramie & LeClaire
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PERPENDICULAR LINES
TWO LINES THAT INTERSECT TO FORM FOUR RIGHT ANGLES
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ANGLES
In geometry, an angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. The magnitude of the angle is the "amount of rotation" that separates the two rays, and can be measured by considering the length of circular arc swept out when one ray is rotated about the vertex to coincide with the other.
Acute AngleRight Angle
Obtuse AngleStraight angleReflex Angle
Adjacent Angle
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ACUTE ANGLES
The measure of an angle with a measure between 0° and 90° or with less than
90° radians.
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EXAMPLES OF ACUTE ANGLES
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RIGHT ANGLE
An angle formed by the perpendicular intersection of two straight lines; an angle of
90°.
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EXAMPLES OF RIGHT ANGLE
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OBTUSE ANGLE
Angle measures greater than 90 degrees but less than 180
degrees.
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EXAMPLES OF OBTUSE ANGLE
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STRAIGHT ANGLE
A straight angle changes the direction to point the opposite way. It looks like a straight line. It measures 180° (half a revolution, or two right angles)
180O
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EXAMPLES OF STRAIGHT ANGLE
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REFLEX ANGLE
A REFLEX ANGLE IS MORE THAN 180° BUT LESS THAN 360°
230O
A
B
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ADJACENT ANGLES
In geometry, adjacent angles, often shortened as adj. ∠s, are angles that have
a common ray coming out of the vertex going between two other rays. In other words, they are angles that are side by
side, or adjacent.
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THEOREMSA GENERAL PROPOSITION NOT SELF-EVIDENT BUT PROVED BY A CHAIN OF REASONING; A TRUTH ESTABLISHED BY MEANS OF ACCEPTED TRUTHS.
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PARALLEL LINES AND TRANSVERSAL
Transversal :- A transversal, or a line that
intersects two or more coplanar lines, each at a different point, is a very useful line in geometry.
Transversals tell us a great deal about angles.
Parallel Lines :- Parallel lines remain the same distance apart over their entire length. No matter how far you extend them, they will never meet.
A B
C D
L
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1)LINEAR PAIR OF ANGLES
A pair of adjacent angles formed by intersecting lines. Linear pairs of
angles are supplementary.A
B
A+B=180O
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2)VERTICALLY OPPOSITE ANGLE
In geometry, a pair of angles is said to be vertical (also opposite and vertically opposite, which is abbreviated as vert. opp. ∠s ) if the angles are formed from two intersecting lines and the angles are not adjacent. They all share a vertex. Such angles are equal in measure and can be described as congruent.
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3)CORRESPONDING ANGLES
The angles that occupy the same relative position at each intersection
where a straight line crosses two others. If the two lines are parallel, the CORRESPONDING ANGLES are
equal.
AA
B
A=B
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4)ALTERNATE INTERIOR ANGLE
WHEN TWO PARALLEL LINES ARE CUT BY A TRANSVERSAL, THE TWO
PAIRS OF ANGLES ON OPPOSITE SIDES OF THE TRANSVERSAL AND INSIDE THE PARALLEL LINES, AND
THE ANGLES IN EACH PAIR ARE CONGRUENT.
AB
A=B
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5)ALTERNATE EXTERIOR ANGLE
When two parallel lines are cut by a transversal, the two pairs of angles on opposite sides of the transversal and outside the parallel lines, and
the angles in each pair are congruent.
A
B
A=B
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6)CO-INTERIOR ANGLES
Interior angles on the same side of the transversal are also referred to as
consecutive interior angles or allied angles or co-interior angles. And there
sum is always 180.
AB
A+B=180O
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7)ANGLE SUM PROPERTY
A
B C
The sum of the measures of the interior angles of a triangle is 180. The diagram
above illustrates the Triangle Angle Sum Theorem.
A+B+C+=180O
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8)EXTERIOR ANGLE PROPERTY
A
B C
The exterior angle theorem is Proposition 1.16 in Euclid's Elements, which states that the measure of an exterior angle of a triangle is greater than either of
the measures of the remote interior angles.
A+B=C
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I would like to express my special thanks of gratitude to my teacher
(MRS.KRITI) who gave me the golden opportunity to do this wonderful project on the topic
LINES AND ANGLES, which also helped me in doing a lot of
Research and i came to know about so many new things I am really
thankful to them.Secondly i would also like to thank my parents and friends who helped
me a lot in finalizing this project within the limited time frame.
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