In an obtuse triangle, the ratio of the three interior angles is 2:8:5, what is the degree of the obtuse angle?
一个钝角三角形，三个内角的度数比是2：8：5，这个钝角为多少度．
<gadget id="calculator">2 + 8 + 5</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">180 * (8/15)</gadget>
<output>96</output>

<result>96</result>