text: const sides = document.querySelectorAll(".side-input");
  const areaBtn  = document.querySelector("#check-area-btn");
  const outputE1 = document.querySelector("#output");
  
  
  
  function calculateSum(a,b) {
      const reaOfTriangleE1 = 0.5*(a*b);
      return (reaOfTriangleE1)
  }
  function calculateAreaTriangle () {
      console.assertog("sj");
  
      
      const areaOfTriangle = calculateSum(Number(sides[0].value),Number(sides[1].value));
      
      outputE1.innerText = (`Area of trangle is ${areaOfTriangle} units`);
  
  } 
  
  areaBtn.addEventListener("click",calculateAreaTriangle)