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Arjun had to find the third angle around a point when the other two are 70° and 65°. He wrote: 180° − 70° − 65° = 45°. What is the correct answer?

Class 7Angles Around a PointLines and Angles
  • A45°; his working is correct
  • B225°; he used 180° instead of 360°
  • C135°; he only needed to subtract 45°
  • D315°; he forgot one angle

Step-by-Step Solution

Angles around a point add to 360°, not 180°. Correct: 360° − 70° − 65° = 225° (a reflex angle).
Answer: B) 225°; he used 180° instead of 360°

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