It is known that in △ABC, ∠B=∠C, ∠B=30°, what is the degree of ∠A?
已知△ABC中，∠B=∠C，∠B=30°，∠A的度数是多少°
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">180 - 60</gadget>
<output>120</output>

<result>120</result>