Question

find the area of a triangle whose height is x cm and base is 3x cm
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Answer 1

$Hence, \: area \: of \: triangle ..\: \\ \\= \: \frac{1}{2} \times base \times height \\ \\ = \frac{1}{2} \times 3x \times x \\ \\ = \frac{1}{2} \times 3x^{2} \\ \\ = \frac{3}{2} {x}^{2} \\ \\=1.5x²$