What is the point of the pointer on the clock after rotating 90° counterclockwise from "7" around point O?
钟表上的指针从"7"绕点O逆时针旋转90°后指向多少．
<gadget id="calculator">90 / 30</gadget>
<output>3</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<result>4</result>