There are a total of 10 points on the plane, and no 3 points are on a straight line. How many straight lines can be drawn from these points?
平面上共有10个点，没有3个点在一条直线上，求过这些点最多可以画出多少条直线？
<gadget id="calculator">10 * 9</gadget>
<output>90</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<result>45</result>