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On a triangle $ABC$, a circle with diameter $BC$ is drawn, intersecting $AB$ and $AC$ at points $P$ and $Q$, respectively. If the lengths of $AB$, $AC$, and $CP$ are $30$ cm, $25$ cm, and $20$ cm respectively, then the length of $BQ$, in cm, is
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Given that,

$\text{BC}$ is a diameter of circle, the lengths of $\text{AB} = 30 \; \text{cm},  \text{AC} = 25 \; \text{cm},$ and $\text{CP} = 20 \; \text{cm}.$

Now, we can draw the diagram :



The angle inscribed in a semicircle is always a right angle.

So, $ \triangle \text{BPC},$ and $ \triangle \text{BQC}$ are right angle triangle.

Now, we can draw the $ \triangle \text{ABC}$ as :



Area of the $\triangle \text{ABC} = \frac{1}{2} \times \text{Base} \times \text{Height} $

$\quad = \frac{1}{2} \times \text{AB} \times \text{CP} $

$\quad = \frac{1}{2} \times 30 \times 20 $

$\quad = 300 \; \text{cm}^{2} $

Again, we can draw the $ \triangle \text{ABC}$ as :



Area of the $ \triangle \text{ABC} = \frac{1}{2} \times \text{AC} \times \text{BQ} $

$ \Rightarrow 300 = \frac{1}{2} \times 25 \times \text{BQ} $

$ \Rightarrow 25 \; \text{BQ} = 600 $

$ \Rightarrow \text{BQ} = \frac{600}{25} $

$ \Rightarrow \boxed{\text{BQ} = 24 \; \text{cm}} $

$\therefore$ The length of $\text{BQ}$ is $24 \; \text{cm}.$

Correct Answer $: 24 $

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