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Measure the Elapsed Time in Python Represent enum Create a Countdown Timer Convert Bytes to a String

Introduction

Print Hello world!Add Two Numbers Find the Square Root Calculate the Area of a Triangle Solve Quadratic Equation Swap Two Variables Generate a Random Number Convert Kilometers to Miles Convert Celsius To Fahrenheit Print Output Without a Newline

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Get the Class Name of an Instance Differentiate Between type() and isinstance()

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Check if a Number is Positive, Negative or 0 Check if a Number is Odd or Even Check Leap Year Find the Largest Among Three Numbers Check Prime Number Print all Prime Numbers in an Interval Find the Factorial of a Number Display the multiplication Table Print the Fibonacci sequence Check Armstrong Number Find Armstrong Number in an Interval Find the Sum of Natural Numbers Create Pyramid Patterns Iterate Over Dictionaries Using for Loop Reverse a Number Compute the Power of a Number

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Add Two Matrices Transpose a Matrix Multiply Two Matrices Check Whether a String is Palindrome or Not Remove Punctuations From a String Sort Words in Alphabetic Order Illustrate Different Set Operations Count the Number of Each Vowel Merge Two Dictionaries Access Index of a List Using for Loop Flatten a Nested List Slice Lists Sort a Dictionary by Value Check If a List is Empty Concatenate Two Lists Check if a Key is Already Present in a Dictionary Split a List Into Evenly Sized Chunks Parse a String to a Float or Int Print Colored Text to the Terminal Convert String to Datetime Get the Last Element of the List Get a Substring of a String Randomly Select an Element From the List Check If a String Is a Number (Float)Count the Occurrence of an Item in a List Delete an Element From a Dictionary Create a Long Multiline String Convert Two Lists Into a Dictionary Trim Whitespace From a String Iterate Through Two Lists in Parallel Count the Number of Digits Present In a Number Check If Two Strings are Anagram Capitalize the First Character of a String Compute all the Permutation of the String Count the Number of Occurrence of a Character in String Remove Duplicate Element From a List

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Merge Mails Find the Size (Resolution) of an Image Find Hash of File Safely Create a Nested Directory Catch Multiple Exceptions in One Line Copy a File Python Program Read a File Line by Line Into a List Append to a File Extract Extension From the File Name Get the File Name From the File Path Get Line Count of a File Find All File with .txt Extension Present Inside a Directory Get File Creation and Modification Date Get the Full Path of the Current Working Directory Check the File Size

JavaScript Program to Calculate the Area of a Triangle

To understand this example, you should have the knowledge of the following JavaScript programming topics:

If you know the base and height of a triangle, you can find the area using the formula:


              
area = (base * height) / 2

Example 1: Area When Base and Height is Known


              
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

If you know all the sides of a triangle, you can find the area using Herons’ formula. If a, b and c are the three sides of a triangle, then


              
s = (a+b+c)/2
area = √(s(s-a)*(s-b)*(s-c))

Example 2: Area When All Sides are Known


              
// JavaScript program to find the area of a triangle

const side1 = parseInt(prompt('Enter side1: '));
const side2 = parseInt(prompt('Enter side2: '));
const side3 = parseInt(prompt('Enter side3: '));

// calculate the semi-perimeter
const s = (side1 + side2 + side3) / 2;

//calculate the area
const areaValue = Math.sqrt(
  s * (s - side1) * (s - side2) * (s - side3)
);

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

Output


              
Enter side1: 3
Enter side2: 4
Enter side3: 5
The area of the triangle is 6

Here, we have used the Math.sqrt() method to find the square root of a number.

Note: If a triangle cannot be formed from the given sides, the program will not run correctly.

Also Read:

JavaScript parseInt()