OAPB is a sector of a circle of radius 3.5 with centre O and angle AOB 120 find the length of OAPBO
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Arc length= radius * angle it subtends at centre in radians.
Length = 3.5*pi/180 *120
=3.5*3.14*2/3
=7.6
Length = 3.5*pi/180 *120
=3.5*3.14*2/3
=7.6
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