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Help please

 working on this for weeeeksss

Guest Mar 14, 2017

Best Answer 

 #1
avatar+5555 
+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 × radius2

 

1)

radius = 11 inches

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

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

area = 3.14 × 112 = 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= 3.14 × 102 = 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
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3+0 Answers

 #1
avatar+5555 
+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 × radius2

 

1)

radius = 11 inches

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

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

area = 3.14 × 112 = 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= 3.14 × 102 = 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
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0

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

Guest Mar 14, 2017
 #3
avatar+5555 
+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

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