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JavaScript program to calculate trapezoid circumference

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Following program shows you how to calculate trapezoid circumference. This program gets trapezoid bases and sides from user and calculates circumference and prints it using following formula Circumference = base1 + base2 + side1 +side2

var trapezoidBase1 = parseInt(prompt("Please enter base1 of trapezoid:"));
var trapezoidBase2 = parseInt(prompt("Please enter base2 of trapezoid:"));
var trapezoidSide1 = parseInt(prompt("Please enter side1 of trapezoid:"));
var trapezoidSide2 = parseInt(prompt("Please enter side2 of trapezoid:"));
var circumferenceOfTrapezoid = trapezoidBase1 + trapezoidBase2 + trapezoidSide1 + trapezoidSide2;
console.log("Circumference of trapezoid is: " + circumferenceOfTrapezoid);

Output:

Please enter base1 of trapezoid:
3
Please enter base2 of trapezoid:
4
Please enter side1 of trapezoid:
8
Please enter side2 of trapezoid:
10
Circumference of trapezoid is: 25.0