# Maths

A sector of a circle of radius 7cm subtending an angle of 270 degree at centre of the circle is use to form a cone?
(A)find the base radius of the cone.
(B)calculate the area of the base of the cone.

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1. Angle/360=length Of An Arc/pi*diameter

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3. it is very important for me

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4. Yes

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5. Solve

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6. 270/360 *2*22/7*7=33
2πr=33
2*22/7=33
44/7*x=33
X=33*7/44
X=5.25

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7. 270/360

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8. (b)
πr^2
=22/7×21/4×21/4
=693/8cm^2 ~87cm^2

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