In a right triangle, if one of the acute angles is 45°, how many degrees is the other acute angle? What kind of triangle is it?
一直角三角形中，已知其中一个锐角是45°，另一个锐角是多少度？它又是什么三角形？
<gadget id="calculator">90 - 45</gadget>
<output>45</output>

<result>45</result>