Respuesta :

Step-by-step explanation:

in an isoceles triangle both sides are equal.

take one of the half right angle triangle

by Pythagoras theorem

√45²=(3)²+(X/2)²

45=9+x²/4

45-36=x²/4

9*4=x²

X=6

option B

Answer:

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Step-by-step explanation:

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