Shape Area Calculator

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Shape Area Calculator body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; margin: 0; padding: 20px; background-color: #f8f9fa; color: #333; } .shape-calc-container { max-width: 800px; margin: 40px auto; padding: 30px; background-color: #ffffff; border-radius: 8px; box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1); display: flex; flex-wrap: wrap; gap: 30px; } .calculator-section { flex: 1; min-width: 280px; } h1, h2 { color: #004a99; text-align: center; margin-bottom: 20px; } .input-group { margin-bottom: 20px; display: flex; flex-direction: column; gap: 8px; } .input-group label { font-weight: 600; color: #004a99; } .input-group input[type="number"], .input-group select { padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-size: 1rem; width: 100%; box-sizing: border-box; } button { background-color: #004a99; color: white; border: none; padding: 12px 25px; border-radius: 4px; cursor: pointer; font-size: 1rem; font-weight: 600; transition: background-color 0.3s ease; width: 100%; } button:hover { background-color: #003366; } .result-section { flex: 1; min-width: 280px; background-color: #e7f3ff; padding: 20px; border-radius: 4px; text-align: center; border: 1px dashed #004a99; } #result { font-size: 2.5rem; font-weight: bold; color: #28a745; margin-top: 10px; word-break: break-word; } .description-section { margin-top: 40px; padding: 20px; background-color: #ffffff; border-radius: 8px; box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1); } .description-section h2 { text-align: left; color: #004a99; } .description-section p, .description-section ul { margin-bottom: 15px; } .description-section ul { padding-left: 20px; } .description-section li { margin-bottom: 8px; } .description-section code { background-color: #eef; padding: 2px 5px; border-radius: 3px; } @media (max-width: 768px) { .shape-calc-container { flex-direction: column; } }

Shape Area Calculator

Square Rectangle Circle Triangle (base & height) Trapezoid

Result

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Understanding Shape Area Calculations

The area of a shape is the amount of two-dimensional space it occupies. Calculating the area is fundamental in geometry and has numerous practical applications, from determining how much paint is needed for a wall to calculating the land size. Below are the formulas for common shapes:

Area Formulas:

  • Square: The area of a square is calculated by squaring the length of one of its sides.
    Formula: Area = side * side or Area = side²
  • Rectangle: The area of a rectangle is the product of its length and its width.
    Formula: Area = length * width
  • Circle: The area of a circle is found by multiplying Pi (approximately 3.14159) by the square of its radius.
    Formula: Area = π * radius²
  • Triangle: The area of a triangle is half the product of its base and its corresponding height.
    Formula: Area = 0.5 * base * height
  • Trapezoid: The area of a trapezoid is half the sum of its two parallel bases multiplied by its height.
    Formula: Area = 0.5 * (base1 + base2) * height

How to Use This Calculator:

  1. Select Shape: Choose the geometric shape from the dropdown menu.
  2. Enter Dimensions: Input the required dimensions (e.g., side length, radius, base, height) into the fields that appear. Ensure you use consistent units for all measurements.
  3. Calculate: Click the "Calculate Area" button.
  4. View Result: The calculated area will be displayed in the result box, along with the appropriate square units (e.g., cm², m², square inches).

Practical Applications:

  • Home Improvement: Estimating the amount of flooring, carpet, or tiles needed for a room.
  • Gardening: Planning the size of garden beds or calculating lawn area for mowing or fertilization.
  • Construction & Design: Determining material requirements for walls, roofs, or any flat surface.
  • Art & Craft: Measuring canvas size or fabric needed for projects.
function updateInputs() { var shapeType = document.getElementById("shapeType").value; var dynamicInputsDiv = document.getElementById("dynamicInputs"); dynamicInputsDiv.innerHTML = ""; // Clear previous inputs if (shapeType === "square") { dynamicInputsDiv.innerHTML = `
`; } else if (shapeType === "rectangle") { dynamicInputsDiv.innerHTML = `
`; } else if (shapeType === "circle") { dynamicInputsDiv.innerHTML = `
`; } else if (shapeType === "triangle") { dynamicInputsDiv.innerHTML = `
`; } else if (shapeType === "trapezoid") { dynamicInputsDiv.innerHTML = `
`; } } function calculateArea() { var shapeType = document.getElementById("shapeType").value; var area = 0; var resultElement = document.getElementById("result"); var unit = "units²"; // Default unit var isValid = true; if (shapeType === "square") { var side = parseFloat(document.getElementById("sideSquare").value); if (!isNaN(side) && side > 0) { area = side * side; } else { isValid = false; } } else if (shapeType === "rectangle") { var length = parseFloat(document.getElementById("lengthRectangle").value); var width = parseFloat(document.getElementById("widthRectangle").value); if (!isNaN(length) && length > 0 && !isNaN(width) && width > 0) { area = length * width; } else { isValid = false; } } else if (shapeType === "circle") { var radius = parseFloat(document.getElementById("radiusCircle").value); if (!isNaN(radius) && radius > 0) { area = Math.PI * radius * radius; unit = "units² (πr²)"; } else { isValid = false; } } else if (shapeType === "triangle") { var base = parseFloat(document.getElementById("baseTriangle").value); var height = parseFloat(document.getElementById("heightTriangle").value); if (!isNaN(base) && base > 0 && !isNaN(height) && height > 0) { area = 0.5 * base * height; } else { isValid = false; } } else if (shapeType === "trapezoid") { var base1 = parseFloat(document.getElementById("base1Trapezoid").value); var base2 = parseFloat(document.getElementById("base2Trapezoid").value); var height = parseFloat(document.getElementById("heightTrapezoid").value); if (!isNaN(base1) && base1 > 0 && !isNaN(base2) && base2 > 0 && !isNaN(height) && height > 0) { area = 0.5 * (base1 + base2) * height; } else { isValid = false; } } if (isValid) { resultElement.textContent = area.toFixed(2) + " " + unit; } else { resultElement.textContent = "Invalid Input"; } } // Initialize inputs on page load document.addEventListener("DOMContentLoaded", updateInputs);

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