Question

the radius of a sector is 21cm and it's central angle is 120°. find (1) the length of the arc (2)area of the sector and (3)perimeter of sector
​

Answer 1

Answer:

given,radius of a sector is 21 cm

central angle is 120°

Step-by-step explanation:

1) length of arc = $\pi$r∅/180

=3.14*21*120/180

=43.9

2)area of the sector=πr²∅/360

=3.14*21*21*120/360

=461.5

3)perimeter of sector = 2r + length of arc

 =2*21+43.9

=129.8

Answer 2

Answer:

given, radius of a sector is 21 CM and central angle is 120°

Step-by-step explanation:

1 the length of arc=πr /360

=3.14*21*120/360

=43.9

2 area of the sector=πr2/360

=3.14*21*21*120/360

=461.5

3 perimeter of sector =2r+length of arc

=2*21+43.9

=129.8