Mathematics, 21.08.2019 20:30 davidebner2248
Circumference of a circle is 40 π cm. a quarter of the circle represents the developer layer genuine coupe. calculate the surface compartment.
Answers: 1
![2 \pi r=40 \pi \ cm\ \ \ \Rightarrow\ \ \ r= \frac{40 \pi }{2 \pi } =20\\\\S= \pi r^2\ \ \ \Rightarrow\ \ \ quarter:\ \ A= \frac{1}{4} \cdot S= \frac{1}{4} \cdot \pi \cdot20\cdot20=100 \pi \ [cm^2]](/tpl/images/0185/7531/d6ff7.png)
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Circumference of a circle is 40 π cm. a quarter of the circle represents the developer layer genuine...
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