Question

2. The radius or diameter of a circle is given. Find the remaining measure.

a) d = 9 m
b)r = 28.5 yd

Answer 1

a) r=4.5 m

b) d= 57 yd

Explanation:

a)

The diameter is twice the radius, which can be written as:

d=2r

We know the diameter is 9, so we can substitute that in for d.

9=2r

To solve for r, we need to isolate the variable. To do this, divide both sides by 2

9/2=2r/2

4.5=r

So, the radius is 4.5 meters

b)

The diameter is twice the radius, or

d=2r

We know the radius is 28.5, so we can substitute that in for r

d=2*28.5

Multiply

d=57

So, the diameter is 57 yards

Answer 2

r = 4.5m

d = 57 yds

Explanation:

The radius is 1/2 of the diameter

d= 9 meter

r = d/2 =9/2 = 4.5 m

The diameter is twice the radius

r = 28.5 yds

d = 2r = 2*28.5 =57 yds