Xiaoli made a beautiful greeting card for her good friend. This greeting card is an isosceles triangle. It is known that one of its base angles is 65°. What is its top angle?
小丽给她的好朋友做了一个精美的贺卡，这张贺卡是一个等腰三角形，已知它的一个底角是65°，请问它的顶角是多少度？
<gadget id="calculator">65 * 2</gadget>
<output>130</output>

<gadget id="calculator">180 - 130</gadget>
<output>50</output>

<result>50</result>