If ob= 17 and ab = 30, then or =

Option A.

Step-by-step explanation:

Given information: OB= 17 and AB = 30

If a line is perpendicular to a chord of a circle and passes through the centre of the circle, then it bisects that chord.

Using this definition we can say that point R is the midpoint of AB.

According to the Pythagoras theorem, in a right angle triangle

Using Pythagoras theorem in triangle ORB,

Taking square root on both sides.

The val;ue of OR is 8 units.

Therefore, the correct option is A.

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40

192/15 = 12.8.

12.8

step-by-step explanation:

192/15 is 12.8.

however, it says to round to the nearest foot, which would equal 13.