how many of these choices is right?

Question

The angle measure,θ, in radians is ...

-found by multiplying two rays of length r meters by a distance of s meters.
-the openness of two rays, r meters long compared to the circumference in meters.
-the relative size of the arc length with respect to the radius of the circle (both measured in meters).
-equal to the number of radius lengths that would mark off the arc length, s
-the relative size of the arc length with respect to the circumference of the circle (both measured in meters).
-the arc length measured in units of the radius.
-the fraction that r is of the total arc length s

 

Answer 1

sector area = radius times angle measured in radians = radius x radians

for example,

quarter circle with radius = 10 m. has area = 1/4 of pi10^2 = 25pi m^2

arc length of 1/4 circle radius 10m is pi(2r)/4 = pi/2 meters