Multiple choice Approximate value of $\dfrac{1}{\sqrt{0.8}}$. $1.2$ $1.3$ $1.1$ $0.1$ Reveal answer Fill a bubble to check yourself C Correct answer Explanation 1 / sqrt(0.8) = 1 / sqrt(4/5) = sqrt(5) / 2. Since sqrt(5) is approximately 2.236, 2.236 / 2 = 1.118, which is approximately 1.1.