If 43

We are asked to find $4.3 \times 4.3$ given that $43 \times 43 = 1849$.

Step 1: Express $4.3$ in terms of $43$:

$4.3 = \frac{43}{10}$

So,

$4.3 \times 4.3 = \frac{43}{10} \times \frac{43}{10} = \frac{43 \times 43}{100}$

Step 2: Substitute $43 \times 43 = 1849$

$4.3 \times 4.3 = \frac{1849}{100} = 18.49$