∠1, ∠2 and ∠3 are three acute angles of a triangle, ∠1=∠2=80°, ∠3=how many degrees
∠1、∠2和∠3是一个三角形的三个锐角，∠1=∠2=80°，∠3=多少°
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">180 - 160</gadget>
<output>20</output>

<result>20</result>