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In the Given Figure, ∠Ace = 43° and ∠Caf = 62° ; Find the Values of A, B and C. - ICSE Class 10 - Mathematics

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Question

In the given figure, ∠ACE = 43° and ∠CAF = 62° ; Find the values of a, b and c.

Solution

Now, ∠ACE = 43° and ∠CAF = 62°     [given]
In ΔAEC
∴ ∠ACE + ∠CAE + ∠AEC = 180°
⇒ 43° + 62° + ∠AEC = 180°
⇒ 105° + ∠AEC = 180°
⇒ ∠AEC = 180° -105° = 75°
Now, ∠ABD + ∠AED = 180°
[Opposite angles of a cyclic quad and ∠AED = ∠AEC]
⇒ a + 75° = 180°
⇒ a = 180° - 75°
 ⇒ a = 105°
 ∠EDF = ∠BAF

  ∴   c = 62°       [Angles in the alternate segments]

In ΔBAF,a + 62° + b = 180°
 ⇒ 105° + 62° + b = 180°
 ⇒ 167° + b = 180°
 ⇒ b = 180° -167° = 13°
Hence, a = 105°, b = 13° and c = 62°

  Is there an error in this question or solution?
Solution In the Given Figure, ∠Ace = 43° and ∠Caf = 62° ; Find the Values of A, B and C. Concept: Arc and Chord Properties - Angles in the Same Segment of a Circle Are Equal (Without Proof).
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