# Solve for r a=(pir^2)/h

Solve for r a=(pir^2)/h
Rewrite the equation as .
Multiply both sides by .
Simplify the left side.
Cancel the common factor of .
Cancel the common factor.
Rewrite the expression.
Solve for .
Divide each term in by and simplify.
Divide each term in by .
Simplify the left side.
Cancel the common factor of .
Cancel the common factor.
Divide by .
Take the square root of both sides of the equation to eliminate the exponent on the left side.
Simplify .
Rewrite as .
Multiply by .
Combine and simplify the denominator.
Multiply and .
Raise to the power of .
Raise to the power of .
Use the power rule to combine exponents.
Rewrite as .
Use to rewrite as .
Apply the power rule and multiply exponents, .
Combine and .
Cancel the common factor of .
Cancel the common factor.
Rewrite the expression.
Simplify.
Combine using the product rule for radicals.
The complete solution is the result of both the positive and negative portions of the solution.
First, use the positive value of the to find the first solution.
Next, use the negative value of the to find the second solution.
The complete solution is the result of both the positive and negative portions of the solution.
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### Name

Name eight hundred sixty-four million eight hundred ninety-four thousand one hundred fifty-two

### Interesting facts

• 864894152 has 32 divisors, whose sum is 2940328188
• The reverse of 864894152 is 251498468
• Previous prime number is 137

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 47
• Digital Root 2

### Name

Name three hundred eighty-four million eight thousand two hundred fourteen

### Interesting facts

• 384008214 has 16 divisors, whose sum is 768395952
• The reverse of 384008214 is 412800483
• Previous prime number is 2173

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 30
• Digital Root 3

### Name

Name two billion one hundred thirty-nine million seven hundred thirty-eight thousand nine hundred forty-two

### Interesting facts

• 2139738942 has 16 divisors, whose sum is 4668521472
• The reverse of 2139738942 is 2498379312
• Previous prime number is 11

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 48
• Digital Root 3