Find the height of a trapezoid with area of 99m2
and the bottom base is twice the top base,
Calculation
"\\qquad\\qquad\n\\begin{aligned}\n\\small 99\\,m^2&=\\small \\frac{1}{2}(6\\,m+3\\,m)h\\\\\n\\small 99\\times2&=\\small \\cancel{2}\\times\\frac{1}{\\cancel{2}}\\times(9)\\times h\\\\\n\\small 99\\times2\\times\\frac{1}{9}&=\\small\\frac{1}{\\cancel{9}}\\times \\cancel{9}h\\\\\n\\small h &=\\small 2\n\\end{aligned}"
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