mini parabola
DESCRIPTION
K J Somiaya Comprehensive College of education. PPT presentation of CAPTRANSCRIPT
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K.J. SOMAIYA COMPREHENSIVE COLLEGE OF EDUCATION TRAINING AND RESEARCH
NAME:- S.LAKSHMIR.NO:- 55
TOPIC:- CONIC SECTION (PARABOLA)
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CONTENT
• HISTORY• DEFINITION• IMPORTANT TERMS• STANDARD EQUATION OF PARABOLA• DERIVATION• SKETCHING OF A PARABOLA• EVALUATION• SOLUTION
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HISTORY
• Discovered by the Greek mathematician Manaechmus.
• He was the tutor of the great Alexander.• The theory applies to the
– Lenses of Telescopes.– Microscopes.– Weather prediction.– Communication by Satellites.– Construction of buildings and bridges.
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DEFINITION
• A conic section is the locus of a point which moves so that its distance from a fixed point is in a constant ratio to its distance from a fixed straight line.
Note:- Fixed Point -> Focus
Fixed Line -> Directrix
Constant Ratio -> Eccentricity ( e )
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P ( MOVING POINT )
S ( FIXED POINT )
M
L
K
D
I
R
E
C
T
R
I
X
Meaning of conic section through diagram
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IMPORTANT TERM
1) AXIS:-The straight line passing through the focus and perpendicular to the directrix is called Axis.
M
B
A
S
P
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IMPORTANT TERM
2) VERTEX :- A point of intersection of a conic with its axis is called a Vertex.
M
A
P1
B
S
P2
P3
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STANDARD EQUATION OF A PARABOLA
y2=4ax
S (a,0)
P (x,y)
A (0,0) Z(-a,0) X
Y
T
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DERIVATION
focus- S(a,0) vertex A(0,0) directrix LMAX - +ve Axis AY- +ve AxisMoving point P(x,y)By definition PS = PM √(x-a)2+(y-0)2 = x+a (x-a)2 +y2 = (x+a)2 x2 + a2 -2ax + y2 = x2 + a2 + 2ax y2 = 4ax
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SKETCHING OF PARABOLA
-5a
-4a
-3a
-2a
5a4a 3a2a a-a
-a-2a-3a-4a-5a
a
2a
3a
4a
5a
X 0 a a 4a 4a
Y 0 2a -2a -4a 4a
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EVALUATION
Q1. Define the following terms.i) Conic section ii) Axisiii) VertexQ2. Tick the correct answer.i) Who discovered Conic Section?
a) Manaechmus
b) AlexanderANS - a
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EVALUATION
ii) The fixed point is known as
a) Vertex
b) Focus
ANS - b
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