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যদি $a:b=b:c$ হয়, তবে প্রমাণ কর যে, $\frac{a}{c}=\frac{a^2+b^2}{b^2+c^2}$

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দেওয়া আছে,
$a:b=b:c$ বা, $\frac{a}{b}=\frac{b}{c}$ বা, $b^2=ac$

Left Hand Side,
$\frac{a}{c}$

Right Hand Side,
$\frac{a^2+b^2}{b^2+c^2}$

$=\frac{a^2+b^2}{b^2+c^2}$

$=\frac{a^2+ac}{ac+c^2}$

$=\frac{a\left(a+c\right)}{c\left(a+c\right)}$

$=\frac{a}{c}$

$\therefore$ Left hand Side $=$ Right Hand Side

অর্থাৎ, $\frac{a}{c}=\frac{a^2+b^2}{b^2+c^2}$ [প্রমাণিত]

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