Diagram shows plan for a garden. AOB is a sector for a circle that origin O and has radius 18 m and ACB is a semi circle with diameter AB. The garden consist of a grassy areas AOB and fenced flowering area ACB. Given that the area for the grassy area AOB is 243 m³. Calculate: a)value of theta in radian b) length in m, fences needed to fence off flowering areas. c) area in m³, the flowering area.

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