Multiply. (2.1 X 10/2) X (3.5 X 10/5)

we first solve each bracket

we can write 2.1 as 21/10 and 3.5 as 35/10

(21/10x10/2)x(35/10x10/5)

the 10's simplify

21/2x35/5=21/2x7=147/2=73.5

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet