Answer:
The correct options are a,b.
Step-by-step explanation:
The area of sector of a circle equals
Area of a sector = 
where 
 is the angle subtended at the center by the sector
 is the angle subtended at the center by the sector
 is the radius of circle
 is the radius of circle
This indicates that area of the sector depends on:
1) Radius of circle
2) Angle  subtended at the center by the sector
3) Area of sector does not depend on pi.
Also if we know the area of the sector only  we cannot calculate area of area of whole triangle as we need one more information either angle of the sector and vice versa.