JavaScript Program to Calculate the Area of a Triangle

const baseValue = prompt('Enter the base of a triangle: ');
const heightValue = prompt('Enter the height of a triangle: ');

// calculate the area
const areaValue = (baseValue * heightValue) / 2;

console.log(
  `The area of the triangle is ${areaValue}`
);

Output

Enter the base of a triangle: 4
Enter the height of a triangle: 6
The area of the triangle is 12