<p>Jeśli podzielimy walec na 2 przekroje osiowowe, będą przypominać prostokąt.<br /><br />Wzór na połowę przekroju:<br /><img class="fm-editor-equation" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAAAQCAYAAACm53kpAAAAAXNSR0IArs4c6QAAAz5JREFUWEfV1lvIplMUB/Df55CUmJCMCSONQw4zSm5Gk4QwF4zDhQvlRigpSbkYZ3MxkiFx4UI5Sw65cMiZKy6QYxQXmAvlEDWlDDP6T2t/Pbbnfc33ZcZn19P7PvtZe+//+q/1X2vP+OuYQZ42dsGWziavY3MjZjt9alds7Xz4o1DEl+ZbbDK2Dp3NxM24YQrsB/AqXsEPO9296QcejG9GTC7BwwgRt2JN2RweX3oC8h4WX8MJWInPitUweH0RdFv9NiYXAhcN+0O4CKfj9UG2xq8rcRduqWBv6QmII3H0R3yEU4u55mA2+R2f4vgFKIVg/x77Yj/8NIhMfL0XV+ACPJ1vYwScjeexAddU9Ns+K/ABNuLQBUhAApbsjUTP7PAleMmI+HBYI2eMgKRHUv1iPNLldvsWLd3YkbOjZHAellVQvsO52FzYWoFrZyfF7yl5BuNw7IOf8XKRs02+YzXgJZyBo/F57RC7sBt9fYKzpkR/tzkSEyCTuspJeBdvYf+K2uM4AItwdZfi9+Hywv9b4Wh1anmRE2JmC31PQA75Cu9XDch7UmcxDsHtuL+rC33kH8TSf0iHYfF8rPYcWxKHotVTsBZXFRkf1po42/YK8Un/Vbgbu9cT/BkJYHCtxgvtsJ6A8/EUnqhnzzogqRNdbU//H5NVy7ZJXWPSfNpynmdwDI4qDJFf5DjEszd+KYLibLsP5DfF8T0sKf1vmkRAmAvL12H9jhL1HPdNRU9/fxSXTVmb/h6irsUdnd2RJednkSDPEj6MVv6/g+guneDFOQJt5onYpCwY2/LtulxNOu5CPDmhKA8Dmf6e4B1XdWq436UlmdSM2M2O/tqbHvpr6X170n0MdC4hc7kg5U7x8RSyW+eJfr+eYJcUT93aC0d00oiPifw5JaEvegJicCCOrRaRiptbVFrMfEmYZ/L8bVmwvYE96lba48n3tLcTq0YFe2TyZWHP9/T856qGnFxZPts+Y3BTtY5hy0sE19Wm/5Yz890nbTeFOdLqM+s0pC0mi0LOt3VBe7OKZBwNKRkJ8kG4s3zeNtkkkBTqx38d/YYnbay/8PRZHPwhp1X+Ifbm27ArjBbB+Ubof73uT+aHt8T7jFRSAAAAAElFTkSuQmCC" data-mlang="latex" data-equation="P%3DrH" /><br /><br />Możemy połączyć 2 prostokąty, a więc wzórem będzie:<br /><img class="fm-editor-equation" src="data:image/png;base64,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" data-mlang="latex" data-equation="Ppo%3D2rH" /><br /><br /><br /></p>