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Step-by-step explanation:
Use congruent formula and side ratio formula.
....................... ............... ................................. ....
Here AD/DB=8:1
And triangle ADE is congruent to triangle ABC
[ ANGLE A IS COMMON, ANGLE D = ANGLE B {parallel}, angle e= angle C]
Hence :
Ad/db=ae/ec=8/1............(1)
And triangle ade is congruent to triangle ecf....... (2)
It is enough for you.. So you can calculate...