NCERT Revision Notes for Chapter 12 Areas Related to Circles Class 10 Maths
CBSE NCERT Revision Notes1
Area of Sector
Answer
Sector: Sector of a Circle is given as part of Circle enclosed by 2 radius and arc.
In the diagram, shaded area OAB is the Sector. Here, θ is the angle subtended by the arc AB on the center O of the circle.
2
Area of Semi Circle
Answer
Semi-Circle is a sector forming an angle 180° with center.
θ=180°
Now, Area of Semi Circle will be given as
3
Area of Quarter Circle
Answer
4
Area of Segment
Answer
Segment is defined as area enclosed by chord and arc of the circle.
5
Perimeter of Sector:
Answer
It is the length which enclosed the sector.
Length of arc AB + OA + OB.
OA=OB=r, that is radius of sector.
So,
