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स्ट्रेट लाइंस
Jul 18, 2024
स्ट्रेट लाइंस
परिचय
पूरा चैप्टर एक सेशन में कवर करेंगे।
सभी महत्वपूर्ण फॉर्मूले और कॉन्सेप्ट कव र होंगे।
कोऑर्डिनेट में मजबूत पकड़ होनी चाहिए।
स्लोप ऑफ़ स्ट्रेट लाइन
Def:
लाइन और पॉजिटिव X-axis के साथ का एंगल।
Important Formulas:
if θ is inclination with x-axis, slope (m) = tan(θ)
Common situations: Horizontal (m=0), vertical (undefined).
लाइन की इक्वेशनें
फॉर्म्स:
General form: ax + by + c = 0
Slope-intercept form: y = mx + c
Intercept form: x/a + y/b = 1
Important:
Properly identify horizontal (y = k) and vertical (x = k) lines.
इम्पोर्टेंट समस्याएँ
Slope Calculation:
Given two points on line (x1, y1) and (x2, y2): m = (y2 - y1) / (x2 - x1)
Example problems on slope calculation.
Equation Formation:
Using slope and one point.
**Intersections and Angles: **
Methods to find angle between two lines: tan(θ) = |(m1 - m2) / (1 + m1
m2)|
सुपर इम्पोर्टेंट फॉर्मूलाज
Point form:
(y - y1) = m(x - x1)
Distance from a point to a line:
(Ax1 + By1 + C) / √(A² + B²)
Distance between two parallel lines:
|C1 - C2| / √(A² + B²)
फैमिली ऑफ़ लाइन्स
Definition:
Set of lines passing through the intersection of L1 and L2.
Form:
L1 + λL2 = 0.
एंगल बाईसेक्टर
Bisectors of two angles formed by two lines.
मेन फ़ॉर्मुल:
Line bisecting b1 and b2: [(l1 - m1) / √(l1² + m1²)] = ±[ (l2 - m2) / √(l2² + m2²)]
Solve for the required bisector equation.
महत्व समझना
मुख्य बातों पर focus:
Positive and negative slopes.
Direct use of formulas for quick solutions.
Practice derivations and applications.
PRACTICE & STRATEGIES
Types of lines
: Practice standard forms, incline angles, family of lines, etc.
Common issues
: Avoiding calculation mistakes, interpreting slope correctly.
Applications
: Practical geometry problems, reflection problems, etc.
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