findPerimeterPentagon()

Step 1: Understand the problem and create the function

To find the perimeter of a pentagon, you need the length of one of its sides. All sides in a regular pentagon are equal. The formula to find the perimeter of a pentagon is Perimeter = 5 * side. Let's start by creating our function.

function findPerimeterPentagon(side){
    // We will do the calculations here
}

Step 2: Check if the input is a number

Next, we ensure that the input provided is a number. If not, we can throw an error.

function findPerimeterPentagon(side){
    if (typeof side !== 'number'){
        throw "Input must be a number";
    }
    // We will do the calculations here
} 

Step 3: Check if the side is a positive number

In addition, the side length of a pentagon must be a positive number. Let's add this condition.

function findPerimeterPentagon(side){
    if (typeof side !== 'number'){
        throw "Input must be a number";
    }
    if (side <= 0){
        throw "Side length must be a positive number";
    }
    // We will do the calculations here
}

Step 4: Calculate the perimeter

Now that we have validated our input, we can calculate the perimeter of the pentagon by multiplying the length of a side by 5.

function findPerimeterPentagon(side){
    if (typeof side !== 'number'){
        throw "Input must be a number";
    }
    if (side <= 0){
        throw "Side length must be a positive number";
    }
    return 5 * side;
}

Conclusion

And there you have it! You now have a function that calculates the perimeter of a pentagon given the length of one of its sides. The function first validates the input to ensure it's a number and is positive. It then calculates and returns the perimeter of the pentagon.

function findPerimeterPentagon(side){
    if (typeof side !== 'number'){
        throw "Input must be a number";
    }
    if (side <= 0){
        throw "Side length must be a positive number";
    }
    return 5 * side;
}