Evaluate
2\pi \left(r+4\right)
Factor
2\pi \left(r+4\right)
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2\pi r+6\pi +2\pi \times 1
Multiply 2 and 3 to get 6.
2\pi r+6\pi +2\pi
Multiply 2 and 1 to get 2.
2\pi r+8\pi
Combine 6\pi and 2\pi to get 8\pi .
2\left(\pi r+3\pi +\pi \right)
Factor out 2.
\pi \left(r+4\right)
Consider \pi r+3\pi +\pi . Factor out \pi .
r+4
Consider r+3+1. Multiply and combine like terms.
2\pi \left(r+4\right)
Rewrite the complete factored expression.
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Simultaneous equation
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Limits
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