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Q.

The aperture of a camera is formed by 10 blades overlapping to form a regular decagon. What is the of ∠BAX?


Class: 10


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a

36°

b

90°

c

60°

d

70° 

answer is A.

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Detailed Solution

We have sum of angles of n – sided polygon
= (n – 2) × 180°
⇒ Sum of angles of decagon = (10 – 2) × 180°
Then regular decagon of each angle
 ⇒ ∠BAX = 180° – 144° = 36°
Hence option (1) is correct.
  
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The aperture of a camera is formed by 10 blades overlapping to form a regular decagon. What is the of ∠BAX? Class: 10