In the triangle ABC, ∠A=75°, ∠B=28°, ∠C is blocked, do you know the degree of ∠C? What kind of triangle is this?
在三角形ABC中，∠A=75°，∠B=28°，∠C被挡住了，你知道∠C多少度吗？这是一个什么三角形？
<gadget id="calculator">75 + 28</gadget>
<output>103</output>

<gadget id="calculator">180 - 103</gadget>
<output>77</output>

<result>77</result>