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- - **help (the area of a sector)**
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help (the area of a sector)I'm using Basic Mathematics by Serge Lang & I'm currently on the geometry section of the book. He explained angles & their measurements in degrees, then on how to get the area of the sector formed by two rays. area of S = x/360 multiplied by the area of the disc One of the exercises goes like this. It gives you a 60 degree angle and the area of the disc, which is 60 in^2 So I look for the ratio between the angle and the full circle 60/360 = 1/6 then I multiply that by the area of the disc 60 in^2 = 10 in^2 but the book says the answer is 1 Am I doing anything wrong or is it the book? |

Re: help (the area of a sector)The book has made an error. |

It's likely that the book should have given 6 in² as the area of the disc instead of 60 in². A reviewer on Amazon specifically notes that there are many discrepancies between the questions and the answers in this book. However, most other aspects of the book are favourably reviewed. |

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