# Physics

The angle of a sector of a circle is 75 If the radius of this circle is increasing at the rate of 0.3cm/s find the rate of increase of the area when the radius is 6cm

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1. a = 75/360 * π * r^2

da/dt = 75/360 * π * 2r dr/dt

da/dt = 75/360 * π * 2 * 6 * 0.3

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2. Teach me I don't know it

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