There is a triangle, the ratio of the degrees of its three angles is 1:2:3, what is the largest angle? What kind of triangle is this?
有一个三角形，它的三个角的度数的比是1：2：3，最大的角是多少度？这是一个什么三角形？
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">180 * (1/2)</gadget>
<output>90</output>

<result>90</result>