The four sides of the Egyptian pyramids are all isosceles triangles, and the top angle of each isosceles triangle is about 52°. What is the approximate base angle of each side of the pyramid?
埃及金字塔的四个侧面的形状都是等腰三角形，每个等腰三角形的顶角约是52°．金字塔每个侧面的底角约是多少度？
<gadget id="calculator">180 - 52</gadget>
<output>128</output>

<gadget id="calculator">128 / 2</gadget>
<output>64</output>

<result>64</result>