Question

2. In equilateral A ABC, AD I BC and
BC = x cm. Find, in terms of x, the length
of AD.​

Answer 1

hey mates your answer is here

in triangle abc... all the sides are x cm (equaletral triangle)

in triangle adc

dc =x/2 and ac = x

by Pythagoras theorem

ac^2 = (x/2)^2 + ad^2

x^2-x^2 /4=ad^2

3x^2/4=AD^2

.. may be it's helpful for you

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Answer 2

I think this clippings may help you