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Right Triangle Area of a Circle (by Peeling)

Author:Tracey Weise, Tim Brzezinski
Topic:Area, Circle
AREA of a CIRCLE: Hit the "Start the Show!" button in the applet below! Then, answer the 5 questions that follow.

Question #1

How does the area of the triangle formed compare with the area of the original circle?

Question #2

What is the formula for the area of a triangle?

Select all that apply
  • A
  • B
  • C
  • D
Check my answer (3)

Question #3

The BASE of this triangle is what "part" of the original circle?

Select all that apply
  • A
  • B
  • C
  • D
Check my answer (3)

Question #4

The HEIGHT of this triangle is what "part" of the original circle?

Select all that apply
  • A
  • B
  • C
  • D
Check my answer (3)

Question #5

Rewrite the formula from #2 above with your responses from #3 and #4 substituted into this formula. This new formula is the formula used to find the area of a circle.

Select all that apply
  • A
  • B
  • C
  • D
Check my answer (3)

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