What is the angle in degrees that is 25% less than the straight angle?
比平角少25%的角是多少度．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">180 * (1/4)</gadget>
<output>45</output>

<gadget id="calculator">180 - 45</gadget>
<output>135</output>

<result>135</result>