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In the Given Figure, Ae is the Diameter of the Circle. Write Down the Numerical Value of ∠Abc+∠Cde. Give Reasons for Your Answer. - Mathematics

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Question

In the given figure, AE is the diameter of the circle. Write down the numerical value of ∠ABC+∠CDE. Give reasons for your answer.

Solution

Join centre O and C and EC.
`∠AOC = (180°)/2 = 90°`
And ∠AOC = 2∠AEC
(Angle at the centre is double the angle at the circumference subtended by the same chord)

⇒`∠AEC = (90°)/2 = 45°`
Now, ABCE is a cyclic quadrilateral
∴ ∠ABC + ∠AEC = 180°
(pair of opposite angles in a cyclic quadrilateral are supplementary)
⇒ ∠ABC =180° - 45° =135°
Similarly, ∠CDE = 135°
∴ ∠ABC + CDE -135° +135° = 270°

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APPEARS IN

 Selina Solution for Concise Mathematics for Class 10 ICSE (2020 (Latest))
Chapter 17: Circles
Exercise 17(A) | Q: 45 | Page no. 261
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In the Given Figure, Ae is the Diameter of the Circle. Write Down the Numerical Value of ∠Abc+∠Cde. Give Reasons for Your Answer. Concept: Arc and Chord Properties - the Angle that an Arc of a Circle Subtends at the Center is Double that Which It Subtends at Any Point on the Remaining Part of the Circle.
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