3.11三维毕达哥拉斯与三角学

这个图表显示了一个长方体PQRSTUVW{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="P q r s t u v w" style="vertical-align:-6px;height:22px;width:101px">．
PV = 17.2 cm{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="P V空间等于17.2空间cm" style="vertical-align:-6px;height:22px;width:108px">
直线之间的夹角PV{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="P V" style="vertical-align:-6px;height:22px;width:25px">而底TUVW{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="T u v w" style="vertical-align:-6px;height:22px;width:56px">长方体的43°{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="43度" style="vertical-align:-6px;height:22px;width:27px">．

计算PT{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="P T" style="vertical-align:-6px;height:22px;width:23px">．

PT ={"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="P T空间等于" style="vertical-align:-6px;height:22px;width:44px">...........................................cm [3]