54 lines
2.0 KiB
PHP
54 lines
2.0 KiB
PHP
<!doctype html>
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<html lang="pl">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport"
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content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Z31 - Pole z wierzchołków</title>
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<link rel="stylesheet" href="style.css">
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</head>
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<body>
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<header>
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<h1>Zadanie Z31</h1>
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<h2>Autor: Jakub Grzegorczyk</h2>
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</header>
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<div class="box">
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Napisz program, który: dla współrzędnych wierzchołka trójkąta (x1,y1), (x2,y2),(x3,y3), oblicza jego pole powierzchni
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<img src="img.png" alt="Wzór">
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</div>
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<div class="box">
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<form action="index.php" method="post">
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<label for="x1">Podaj x<sub>1</sub>: </label><br>
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<input type="number" name="x1" id="x1"><br><br>
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<label for="y1">Podaj y<sub>1</sub>: </label><br>
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<input type="number" name="y1" id="y1"><br><br>
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<label for="x2">Podaj x<sub>2</sub>: </label><br>
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<input type="number" name="x2" id="x2"><br><br>
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<label for="y2">Podaj y<sub>2</sub>: </label><br>
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<input type="number" name="y2" id="y2"><br><br>
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<label for="x3">Podaj x<sub>3</sub>: </label><br>
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<input type="number" name="x3" id="x3"><br><br>
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<label for="y3">Podaj y<sub>3</sub>: </label><br>
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<input type="number" name="y3" id="y3"><br><br>
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<button type="submit">Oblicz</button>
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<br>
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</form>
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</div>
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<div class="box">
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<?php
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if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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$x1 = (float)htmlspecialchars($_POST['x1']);
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$y1 = (float)htmlspecialchars($_POST['y1']);
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$x2 = (float)htmlspecialchars($_POST['x2']);
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$y2 = (float)htmlspecialchars($_POST['y2']);
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$x3 = (float)htmlspecialchars($_POST['x3']);
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$y3 = (float)htmlspecialchars($_POST['y3']);
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$pole = abs(($x1 * ($y2 - $y3) + $x2 * ($y3 - $y1) + $x3 * ($y1 - $y2)) / 2);
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echo "Pole powierzchni trójkąta wynosi: " . round($pole, 2);
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}
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?>
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</div>
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</body>
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</html>
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