Which expression is equivalent to cos(4a)?
1 answer:
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Answer:
r=1/π
Step-by-step explanation:
Area of the circle is defined as:
Area = πr²
Derivating both sides
=2πr
=
x
= 2πr
If area of an expanding circle is increasing twice as fast as its radius in linear units. then we have : =2
Therefore,
2πr = 2
r=1/π
A = l * w
66 = l * (l - 5)
66 =
-5l
0 =-5l - 66
l = 11 or 6 check which works.
A = 11 * 6, which fits.
length = 11 miles
width = 5 miles
66 = l * (l - 5)
66 =
0 =
l = 11 or 6 check which works.
A = 11 * 6, which fits.
length = 11 miles
width = 5 miles