Three angles of a four-sided shape are 90, 90 and 100 degrees. What is the fourth angle?
Answer and explanation
Correct answer: A. 80 degrees
- Step 1: The angles in a four-sided shape add up to 360. Step 2. 360 - 90 - 90 - 100 = 80. Answer: 80 degrees. Why not the others: these do not give 360 in total.
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