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Question

Let C be a circle with centre O. Let AB be a tangent to C such that AB touches the circle at point P. Let X and Y be any two points on C. If $\angle APX = 50^\circ$ and $\angle BPY = 60^\circ$, then find $\angle PXY$ and $\angle PYX$, respectively.

The correct answer is
$60^\circ , 50^\circ$

Circle Tangent Angle Calculation

This solution utilizes the Angle Between Tangent and Chord Theorem to determine the required angles.

Tangent-Chord Theorem Explained

The Angle Between Tangent and Chord Theorem establishes that the angle formed by a tangent and a chord drawn from the point of contact is equivalent to the angle subtended by the chord in the alternate segment of the circle.

Angle Calculations

  • Given: AB is a tangent to circle C at point P.
  • Given: $\angle APX = 50^\circ$. This angle is formed between the tangent AB and the chord PX.
  • As per the Tangent-Chord Theorem, the angle subtended by chord PX at the circumference in the alternate segment (at point Y) is equal to $\angle APX$.
  • Therefore, $\angle PYX = \angle APX = 50^\circ$.
  • Given: $\angle BPY = 60^\circ$. This angle is formed between the tangent AB and the chord PY.
  • As per the Tangent-Chord Theorem, the angle subtended by chord PY at the circumference in the alternate segment (at point X) is equal to $\angle BPY$.
  • Therefore, $\angle PXY = \angle BPY = 60^\circ$.

Resulting Angles

The question requires finding $\angle PXY$ and $\angle PYX$ respectively.

  • $\angle PXY = 60^\circ$
  • $\angle PYX = 50^\circ$

The respective angles are $60^\circ$ and $50^\circ$.

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Important Questions from Circles

  1. The sum of the radius and diameter of a circle is 84 cm. What is the circumference of this circle?

  2. The maximum area of a right-angled triangle inscribed in a circle of radius r is

  3. The tangent at a point C of a circle and diameter AB when extended intersect at D, if ∠DCA = 110°, then ∠CBA is equal to

  4. The equation of a circle with diameters are 2x - 3y + 12 = 0 and x + 4y - 5 = 0 and area of 154 sq. units is

  5. The internal center of similitude of two circles $ (x - 1)^2 + (y - 3)^2 = 4 $ and $ (x + 5)^2 + (y - 9)^2 = 16 $ is

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