If the base and height of a triangle row are both increased by 10%, what is the increase in the area of the new triangle compared to the original triangle?
一个三角行的底与高都增加10%，新三角形的面积比原来三角形的增加多少
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) * (11/10)</gadget>
<output>121/100 = around 1.21</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(121/100) - 1</gadget>
<output>21/100 = around 0.21</output>

<result>21/100 = around 0.21</result>