Respuesta :
The arc length is, 720 ft.
How to find the relation between angle subtended by the arc, the radius and the arc length?
[tex]2\pi^c = 360^\circ = \text{Full circumference}[/tex]
The superscript 'c' shows angle measured is in radians.
If radius of the circle is of r units, then:
[tex]1^c \: \rm covers \: \dfrac{circumference}{2\pi} = \dfrac{2\pi r}{2\pi} = r\\\\or\\\\\theta^c \: covers \:\:\: r \times \theta \: \rm \text{units of arc}[/tex]
Length of an arc is given by:
l = r Ф .....[1]
where r is the radius of the circle and Ф is the angle in radian.
From the given information;
In a circle with a radius 8 ft with an arc AB intercepted by a central angle of pi/4 radians.
r = 8 ft and radian pi/4
Substitute these values in [1] we have;
l = r Ф
l = 8 x pi/4 ft.
l = 4 pi
l = 4 x 180
l = 720 ft
therefore, the arc length is, 720 ft.
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