The four sides of the pyramid are all isosceles triangles, and the base angle of each isosceles triangle is about 64 degrees. What is the apex angle of each isosceles triangle?
金字塔的四个侧面都是等腰三角形，每个等腰三角形的底角大约都是64度，每个等腰三角形的顶角约是多少°
<gadget id="calculator">64 * 2</gadget>
<output>128</output>

<gadget id="calculator">180 - 128</gadget>
<output>52</output>

<result>52</result>