Question
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.
(A)find the base radius of the cone.
(B)calculate the area of the base of the cone.
Answers
Angle/360=length Of An Arc/pi*diameter
what is the answer
it is very important for me
Yes
Solve
270/360 *2*22/7*7=33
2πr=33
2*22/7=33
44/7*x=33
X=33*7/44
X=5.25
2πr=33
2*22/7=33
44/7*x=33
X=33*7/44
X=5.25
270/360
(b)
πr^2
=22/7×21/4×21/4
=693/8cm^2 ~87cm^2
πr^2
=22/7×21/4×21/4
=693/8cm^2 ~87cm^2
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