#1**+6 **

Ah you can do these! I believe in you!

Just use these equations and plug in what you know:

radius = ½ × diameter

diameter = 2 × radius

circumference = 3.14 × diameter

area = 3.14 × radius^{2}

1)

radius = 11 inches

diameter = 2 × radius = 2 × 11 = 22 inches

circumference = 3.14 × diameter = 3.14 × 22 = 69.08 inches

area = 3.14 × 11^{2} = 3.14 × 121 = 379.94 square inches

2)

radius = ½ × diameter = ½ × 20 = 10 feet

diameter = 20 feet

circumference = 3.14 × diameter = 3.14 × 20 = 62.8 feet

area = 3.14 × radius^{2 }= 3.14 × 10^{2} = 3.14 × 100 = 314 square feet

I hope this made sense!

Can you do the third one by yourself? It's almost identical to the first one.

hectictar
Mar 14, 2017

#1**+6 **

Best Answer

Ah you can do these! I believe in you!

Just use these equations and plug in what you know:

radius = ½ × diameter

diameter = 2 × radius

circumference = 3.14 × diameter

area = 3.14 × radius^{2}

1)

radius = 11 inches

diameter = 2 × radius = 2 × 11 = 22 inches

circumference = 3.14 × diameter = 3.14 × 22 = 69.08 inches

area = 3.14 × 11^{2} = 3.14 × 121 = 379.94 square inches

2)

radius = ½ × diameter = ½ × 20 = 10 feet

diameter = 20 feet

circumference = 3.14 × diameter = 3.14 × 20 = 62.8 feet

area = 3.14 × radius^{2 }= 3.14 × 10^{2} = 3.14 × 100 = 314 square feet

I hope this made sense!

Can you do the third one by yourself? It's almost identical to the first one.

hectictar
Mar 14, 2017

#2**0 **

V ...............................No.............i can't Do it.....................It's so hard ;-; .............. :|

Guest Mar 14, 2017

#3**+6 **

Well let's look at the third one.

They tell us that the radius is 19 yards.

So how can we find the diameter?

Look at the equation for diameter.

**diameter = 2 × radius**

Oh, but we know what the radius is!

So let's replace the word "radius" with what we know the radius is, 19 yards.

**diameter = 2 × 19 yards**

Now just grab your calculator and type in, "2 × 19." Whatever you get is the diameter.

**diameter = 38 yards**

Does that make any sense?

hectictar
Mar 14, 2017