One irrational number is π, also known as pi. A rational number is one that can be written as a ratio of two integers (whole numbers). Pi goes on forever, so it can't be written as a ratio. Therefore, π is irrational.
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
step 1
<em>Calculate the volume of the cylinder (flower vase)</em>
The volume is equal to

we have
 -----> the radius is half the diameter
 -----> the radius is half the diameter

substitute the values
 ------> exact value
 ------> exact value
step 2
Calculate  2/3 of the volume

  
        
             
        
        
        
Answer:
12
Step-by-step explanation:
Using the 30-60-90 triangle formula side AB would be double of side CB.
 
        
             
        
        
        
Answer:
It goes into 20 because 4 is a factor of 20 on the multiplication chart
Step-by-step explanation:
4*1=4
4*2=8
4*3=12
4*4=16
4*5=20
4+4+4+4+4
   8+8+4
      16+4
           20