In the figure, how many of the six marked angles are greater than 90∘90^\circ?

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Worked solution

8

1. Identify the angles greater than 90 degrees from the figure description

Based on the description of the figure:

  • Bottom-left angle: looks like 90∘90^\circ (not greater than 90∘90^\circ)
  • Middle-left angle: reflex/obtuse, marked on the inside (greater than 90∘90^\circ)
  • Top-left angle: obtuse (greater than 90∘90^\circ)
  • Top-middle angle: obtuse (greater than 90∘90^\circ)
  • Top-right angle: obtuse (greater than 90∘90^\circ)
  • Bottom-right angle: looks like 90∘90^\circ (not greater than 90∘90^\circ)

2. Count the number of angles greater than 90 degrees

There are 4 angles that are obtuse or reflex, which means they are greater than 90∘90^\circ.

Answer

4 (option 4)

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