What is the length of the altitude of the equilateral triangle below?

we are given

equilateral triangle

we can see that triangle ACD is a right angled triangle

so, we can use Pythagoras theorem for this triangle

hypotenuse=AC

Adjacent=CD

opposite=AD=a

and

now, we can use Pythagoras theorem

and we get

now, we can plug values

now, we can solve for a

so, option-A..........Answer

c

step-by-step explanation:

at least i think its