It is known that ∠1, ∠2, and ∠3 are the three interior angles of a triangle, where ∠1=70°, ∠2=35°, then ∠3=how many.
已知∠1、∠2、∠3是三角形中的三个内角，其中∠1=70°，∠2=35°，那么∠3=多少．
<gadget id="calculator">180 - 70 - 35</gadget>
<output>75</output>

<result>75</result>