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Given arccos (4x) = θ, we can find that cos (θ)= and construct the following right triangle: To find tangent, we need to find the opposite side, since tan (θ)=. Let b be the length of the opposite side. Using the Pythagorean theorem, (4x) 2 + b 2

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Th e formula for calculating the arc states that: Arc length = 2πr (θ/360) Where r = the radius of the circle, π = pi = 3.14 θ = the angle ( in degrees) subtended by an arc at the center of the circle. 360 = the angle of one complete rotation. From

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To calculate arc length without radius, you need the central angle and the sector area: Multiply the area by 2 and divide the result by the central angle in radians. Find the square root of this division. Multiply this root by the