A chord PO of a circle of radius 18cm subtends an angle of 3/4pie radians...

A chord PO of a circle of radius 18cm subtends an angle of 3/4pie radians at the centre O, of the circle. Calculate, correct to three significant fugures:
a.The area of triangle POQ
b.The area of the sector POQ;
c.The area of the minor sentence cut off by the chord PQ and the minor arc PQ (Take π=3.142)?

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