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**Resistance in a circuit ,,**

## Homework Statement

Hi guys ,, I have the following picture

## The Attempt at a Solution

OK ,, I know it's easy but my answer's is not like my teacher's answer :

for (a) I get 6.12 ohm and for (b) I get 2.4 ohm

but my teacher's answer is :

a. Rt=4+4+4=12 ohm

b. Rt= (8//4)+4= 6.667 ohm

what I don't get for :

a. how can he just add them together ,, it's not like they are in series and 2 of them are in parallel .. and I don't know why adding only 3 resistors only ?? there are 5 ~.~ ,,

b.how come 8//4 and there is a resistor between 4 & 4 ,, so don't we have to take a parallel (4//4) then add with 4 then parallel them with the upper resistor ??

so can someone simplify circuits please -_- ,, (I usually use current direction to know whether they are in parallel or series)

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