Question

Perimeter of sector that has a diameter of 21

Answer 1

diameter = 2r = 21 cm

radius = r = 21/2 cm

$semi circumference of circle = \pi \: r \\ = \frac{22}{7} \times \frac{21}{2} \\ = 33 \: cm$

Perimeter = Semi circumference + diameter

$= 33 + 21 \\ = 54cm$

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Answer 2

Answer:

32 cm. ASSUMING ANGLE AS 60 DEGREE

Step-by-step explanation:

Radius = 10.5 cm and Sector angle = 60°

Perimeter of a sector of a circle = [(theta/360°)*2πr] + (2r)

⇒[(60/360)*2*22/7*10.5] + (2*10.5)

⇒ 1*462/6*7 + 21

⇒ 462/42 + 21

⇒ 11 + 21

⇒ 32 cm