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Mathematics 47 Online
OpenStudy (anonymous):

Find the area of a sector with a central angle of 100° and a diameter of 5.6 cm. Round to the nearest tenth. A) 27.4 cm2 B) 3.1 cm2 C) 1.2 cm2 D) 6.8 cm2 I must be doing something wrong...

OpenStudy (amistre64):

teh sector is the pie shape of the arc left over?

OpenStudy (amistre64):

make sure your calculator is set to degree for the 100

OpenStudy (amistre64):

and then its just angle*radius/2

OpenStudy (amistre64):

well; i spose youneed to swap degrees into radians ...

OpenStudy (amistre64):

100 needs a pi soo 100pi ----- = radian measure 180

OpenStudy (amistre64):

area = angle r^2/2

OpenStudy (amistre64):

I get 27.366...

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