# Solve a problem. The central corner is equal in a circle of the radius of 5 cm 45 degrees Find: 1) with an accuracy of 0.01 cm length of an arch on which it relies; 2) with an accuracy of 0.01 cm in a square the area of the sector formed by this corner.

Dalanadar

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1) Arch length = l = m/360•2πr m-central corner of l = 45/360•2•3.14•5=3.925 ≈ 3.93 cm 2) area of the sector = S = m/360•πr^2=45/360•3.14•25=9.8125 ≈ 9.81см^2

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Valentina

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