Angle subtended by a chord PQ on the centre of a circle is 180 degree. If length of chord PQ is 54 cm, then what will be the diameter of this circle?

81 cm 64 cm 54 cm 27 cm

54 cm

If an angle subtended by a chord on the circumference of a circle is 180 degrees, then the chord is the circle's diameter. So the length of the diameter is 54 cm. Therefore, length of diameter is 54 cm.