The ratio of the three interior angles of a triangle is 1:2:3, what is the largest interior angle of this triangle? What kind of triangle is it?
一个三角形的三个内角度数比是1：2：3，这个三角形的最大内角是多少度？它是一个什么样的三角形？
<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>