Question

if area of sector of a circle is 105 cmsq and length of its arc is 30 cm calculate the radius of the circle​

Answer 1

Step-by-step explanation:

arEa of the sector = 1/2lr = 1/2 × 30 × r = 105

15r = 105

r = 7cm

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Answer 2

Answer:

105 = Ф* πr²/360°

30 = Ф*2πr/360

solve these 2 equations by substitution method and you  will get the value of "r".