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Chapter 6 of 13
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Circles And Lines

Kerala Board · Class 10 · Mathematics

Flashcards for Circles And Lines — Kerala Board Class 10 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.

43 questions20 flashcards5 concepts

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Card 1Intersecting Chords

What is the fundamental relationship when two chords intersect inside a circle?

Answer

When two chords of a circle intersect within the circle, the product of the parts of one chord equals the product of the parts of the other chord. If chords AB and CD intersect at point P, then: AP ×

Card 2Intersecting Chords

A chord of length 10 cm is divided by another intersecting chord into segments of 6 cm and 4 cm. If one segment of the second chord is 3 cm, find the length of the other segment.

Answer

Step 1: Apply the intersecting chords theorem AP × PB = CP × PD Step 2: Substitute known values 6 × 4 = 3 × PD 24 = 3 × PD Step 3: Solve for the unknown segment PD = 24 ÷ 3 = 8 cm Therefore, the ot

Card 3Perpendicular Chords

What special relationship exists when a diameter is intersected by a perpendicular chord?

Answer

When a diameter of a circle is cut by a perpendicular chord, the product of the parts of the diameter equals the square of half the perpendicular chord. If parts of diameter = a and b, and half-chord

Card 4Perpendicular Chords

A diameter is divided by a perpendicular chord into segments of 3 cm and 2 cm. Find the length of the perpendicular chord.

Answer

Step 1: Apply the perpendicular chord theorem Product of diameter segments = (half-chord)² 3 × 2 = c² Step 2: Calculate 6 = c² c = √6 cm Step 3: Find full chord length Full chord = 2c = 2√6 cm Ther

Card 5Geometric Construction

How can you construct a line of length √5 cm using circle geometry?

Answer

Step 1: Draw a line segment of length 6 cm Step 2: Mark point P such that AP = 2 cm and PB = 3 cm (so 2 × 3 = 6) Step 3: At P, draw a perpendicular line Step 4: Draw a semicircle with AB as diameter S

Card 6Power of Point

What is the general formula for the product when a line through point P intersects a circle?

Answer

For a circle with radius r and point P at distance d from center: If P is INSIDE the circle: PX × PY = r² - d² If P is OUTSIDE the circle: PX × PY = d² - r² General form: PX × PY = |r² - d²| Where

Card 7Power of Point

A point P is 5 cm from the center of a circle with radius 3 cm. A line through P intersects the circle. Find the product PX × PY.

Answer

Step 1: Identify the given information Radius r = 3 cm, Distance d = 5 cm Since d > r, point P is OUTSIDE the circle Step 2: Apply the formula for external point PX × PY = d² - r² Step 3: Calculate

Card 8Tangent and Secant

What is the relationship between the power of a point and tangent length?

Answer

For a point P outside a circle: PX × PY = PT² Where: - X, Y are intersection points of any secant through P - T is the point of tangency from P to the circle - PT is the tangent length This means: T

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What are the important topics in Circles And Lines for Kerala Board Class 10 Mathematics?
Circles And Lines covers several key topics that are frequently asked in Kerala Board Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
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