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3 years ago

12

Can anyone send working of this please ?

1 answer:

andrezito [222]3 years ago

4 0

The parallel lines create similar triangles. Which means sides are proportional...
$\frac{BR}{CS} = \frac{AR}{AS}$
$\frac{BR}{CS} = \frac{10}{14} = \frac{5}{7}$
So if then the ratio of AR to AS = 5/7
Create a proportion with the other similar triangle that contains the shared side:
$\frac{5}{7} = \frac{e}{18}$
Cross multiply
e = $\frac{90}{7}=12 \frac{6}{7}$

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