The radius of a sector is 21 cm with an included angle of 120 degrees. What is the area of the sector, in square centimetres?
A) 462
(B) 698
(C) 924
(D) 1386
Answers
Answered by
1
Answer:
Here,r=21cm, angle of sector is(¶) 120°
area of sector = πr²¶/360°
=22/7×21×21×120°/360°
=22×3×21/3
=22×21
=462cm²
Answered by
1
Answer:
A) 462
Step-by-step explanation:
angle=120°
Radius,R=21 cm
Circumference of the base = Length of an arc
2*pi*r=(theta/360°)* 2* pi* R
r= ( 120/360°) * 21
=7 cm
Slant height= radius of the sector
l= 21 cm
CSA =pi*r* l
=(22/7)*21
=462 Sq.cm
Thus, CSA of cone =462 sq.cm
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