Arc Length and Sector Area Problem Video
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(A).
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arc length = n/360deg x 2 x pi x rad.
sector area = n/360deg x pi x rad. sq.
that will give you deg. it slightly different form if you want radians
sorry about having to write them that way hope that helps
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In a unit circle, the arc length would be pi/6. This arc's length is 6pi, or 36 times as long, which means the radius is 36 times that of a unit circle.
Since the area is proportional to r^2, this circle's area is 36^2 times that of a unit circle, or 1296pi.
30 degrees is 1/12 of a circle, so the area of the sector is 1296pi/12 or 108pi, answer A.
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Can put up the formulas for arc length and sector area? I don't understand how to do them
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Can you explain what --> means? Im having a hard time following
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ans is (A)
30 -> 6pi
360 ->6pi*360/30 =72 pi
2pi r=72pi
r=36
area os sector=
360 -> pi*r*r
30 -> pi*r*r*30/360 -> pi*r*r/12
subsituting the value of r
area of sector=108 pi
NidhiS 5 years ago
correct
mathproblems 5 years ago