單位 px 與 cm 如何轉換? 1920x1080到底在投影片中是幾公分

<h1 class="entry-title" style="border: 0px; margin: 0px; padding: 0px; vertical-align: baseline; clear: both; font-family: 'Helvetica Neue', Arial, Helvetica, 'Nimbus Sans L', sans-serif; line-height: 1.3em; font-size: 21px; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> 在 PowerPoint (ppt) 製作，要在網頁的截圖上開始設計動畫時, 特別需要～ <h1 class="entry-title" style="border: 0px; margin: 0px; padding: 0px; vertical-align: baseline; clear: both; font-family: 'Helvetica Neue', Arial, Helvetica, 'Nimbus Sans L', sans-serif; line-height: 1.3em; font-size: 21px; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> 1cm = ?px, 1px = ?cm. <div class="entry-content" style="border: 0px; margin: 0px; padding: 12px 0px 0px; vertical-align: baseline; clear: both; color: #333333; font-family: Georgia, 'Bitstream Charter', serif; font-size: 16px; line-height: 24px; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> 公分(cm) 與 px 如何轉換?

1px = 0.04cm 1cm = 25px

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