In a triangle, the ratio of the degrees of the three angles is 2:3:4. What is the largest angle of this triangle? What kind of triangle is this?
在一个三角形中，三个角的度数的比是2：3：4．这个三角形最大角为多少度？这是一个什么三角形？
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">180 * (4/9)</gadget>
<output>80</output>

<result>80</result>