Question

If you rotate the spinner in which you have 12 parts, 3 shaded and 9 unshaded parts, the probability of getting unshaded parts:
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Answer 1

Step-by-step explanation:

A dart is thrown at random onto a board that has the shape of a circle as shown below. Calculate the probability that the dart will hit the shaded region. (Use π = 3.142)



Solution:

Total area of board = 3.142 × 14 2 = 615.83 cm2

Area of non-shaded circle = 3.142 × 7 2 = 153.99 cm2

Area of shaded region = 615.83 – 153.99 = 461.84 cm2 = 462 cm2 (rounded to whole number)

Probability of hitting the shaded region = 

Answer 2

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