Odpowiedź:
1/2 * (|CD| + |AB|) * h = 72
|CD| = 4 * 2
|CD| = 8
|AB| = 4 + 8 + 4
|AB| = 16
1/2 * (8 + 16) * h = 72
1/2 * 24 * h = 72 /: (1/2 * 24)
h = 72 : 12
h = 6
[tex]4^{2} + 6^{2} = x^{2} \\16 + 36 = x^{2} \\52 = x^{2} /\sqrt{} \\\sqrt{52} = x\\\sqrt{13 * 4} = x\\2\sqrt{13} = x \\Obw. = 2 * 2\sqrt{13} +8 + 16\\Obw. = 4\sqrt{13} + 24[/tex]
P = 1/2 * 4 * 6
P = 12
