Question

determine total resistance of circuit

Answer 1

The upprr triangular part has two resistors in series connection
hence, R1 = 3+7 = 10 ohms

Now the series part n the base of ∆ is in parallel connection.
1/R2 = 1/10 + 1/10 = 1/5 ohms
R2 = 5 ohms
Now the total part os in series
hence, R = 5+5+5 = 15 ohms

Hence, 15 ohms is the total resistance in the circuit.

Hope i helped