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Gekata [30.6K]
4 years ago
14

I Need Help Pls ASAP

Mathematics
1 answer:
wolverine [178]4 years ago
7 0
We know that
∠ECD=∠ACB------> given in the problem
∠DEC=∠CAB------> 90°
so
∠EDC=∠ABC

therefore
triangles EDC and ABC are similar
<span>So
the ratio of the legs are equal</span>

 \frac{x}{9} = \frac{140-x}{81}  \\ 81*x=9*(140-x) \\ 81x+9x=1260 \\ 90x=1260 \\ x=14

AC=140-x \\ AC=140-14 \\ AC=126

the answer is
AC is equal to 126
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