Use the rules for multiplication by powers 100 to calculate 20 x 100

Multiplication by a power of 10 requires only that you add the number of zeros indicated by the power. Multiplying by 100 = 10² will add 2 zeros on the right.

... 20 × 100 = 2000

Multiplying by 10⁰ will add 0 zeros on the right.

... 20 × 10⁰ = 20

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