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NCERT Trigonometry Class 10 Exercise 8.3 Solutions

Trigonometric Ratios of Complementary Angles  Important identities: 1. sin(90 – θ) = cosθ 2. cos(90-θ) = sinθ 3. tan(90-θ) = cotθ 4. cot(90-θ) = secθ 5. sec(90-θ) = cosecθ 6. cosec(90-θ) = secθ Q.1 Evaluate the following: (i) sin18°/cos72° Solution: sin18°/cos72° = sin( 90°- 72° )/cos72°   [ sin(90-θ) = cosθ ] = cos 72° / …

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Area related to circles Question Number - 1

NCERT Area Related to Circles Class 10 Chapter 12 Exercise – 12.1 Solution

Important Points: Perimeter of or Circumference of Circle = 2πr Area of Circle = π r² Area of Minor Sector = (θ/360º)  πr² Area of Major Sector = (360º-θ)πr²/360º Length of Arc = (θ/360º) 2 r Area of Minor Segment = [ (θ/360º) π – sin(θ/2)cos(θ/2)] r² Area of Major Segment = Area of Circle …

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