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An isosceles right triangle is to be constructed with its right angle at A. The two equal acute angles each measure (in degrees):

Class 9Constructions of TrianglesGeometry
  • A90
  • B41
  • C49
  • D45

Step-by-Step Solution

The angles sum to 180°, the right angle takes 90°, leaving 90° shared equally between the two equal angles: 90/2 = 45° each.
Answer: D) 45

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