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Ravi measured this angle and wrote 115°. Arm OA is on the 0 line on the right. What mistake did he make?

Class 6Measuring AnglesGeometry
  • AHe misread; it is 165°
  • BHe should add 90°
  • CNo mistake; it is 115°
  • DHe read the wrong scale; it is 65°

Step-by-Step Solution

OA starts at 0 of the OUTER scale, so the outer scale must be read: 65°. 115° is the inner-scale number (180 − 65). The angle is acute, so 115° cannot be right.
Answer: D) He read the wrong scale; it is 65°

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