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Meera is verifying that a paper quadrilateral she cut is valid.
She measures three angles: 130°, 70° and 95°.
The fourth angle she measures as 70°, but suspects an error.
What should the fourth angle actually be, and is there an error?

Class 9Angle Sum Property of QuadrilateralsGeometry — Quadrilaterals
  • A65° — yes, there is an error
  • B70° — no error
  • C75° — yes, there is an error
  • D60° — yes, there is an error

Step-by-Step Solution

Fourth should be 360 - (130 + 70 + 95) = 360 - 295 = 65°. Her measured 70° is wrong, so there is an error.
Answer: A) 65° — yes, there is an error

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