下图由三条直线构成。找到…的价值x{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="x" style="vertical-align:-6px;height:22px;width:11px" loading="lazy">.
在三角形内标出其他缺失的角。
两条相交线的垂直对角相等。
y = 60{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="Y空间等于空间60" style="vertical-align:-6px;height:22px;width:54px" loading="lazy">
在直线上交角之和为180°。
z + 130 = 180 z = 50{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="表中行单元格z空格加单元格130空格端单元格等于单元格空间180空格端单元格行单元格z空格端单元格等于单元格空间50端单元格" style="vertical-align:-25px;height:48px;width:118px" loading="lazy">
三角形内角和为180度。
x + 60 + 50 = 180 x + 110 = 180{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="表行单元格x空格加空格60空格加空格50空格端单元格等于单元格空格180空格端单元格x空格加空格110空格端单元格等于单元格空格180端单元格" style="vertical-align:-25px;height:48px;width:153px" loading="lazy">
x = 70{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}" class="Wirisformula" role="math" alt="加粗斜体x加粗空格等于加粗空格70" style="vertical-align:-6px;height:22px;width:60px" loading="lazy">