The surface area of a cylinder is 153 square meters, the lateral area is 78 square meters, what is the area of a base in square meters?
一个圆柱体的表面积是153平方米，侧面积是78平方米，一个底面的面积是多少平方米．
<gadget id="calculator">153 - 78</gadget>
<output>75</output>

<gadget id="calculator">75 / 2</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>