Question

1 In the accompanying diagram of A ABC, a right angle is at C, AB = 8, and AC = 4. Find BC.

Answer 1

`\begin{gathered} \text{We know that } \\ BA^2=AC^2+CB^2 \\ 8^2=4^2+BC^2 \\ BC^2=8^2-4^2 \\ BC^2=64-16 \\ BC^2=48 \\ \\ BC=\sqrt[]{48} \\ BC=4\sqrt[]{3} \end{gathered}`