Answer: Using trigonometry, we can find the length of side AC. Since we know the length of side BC and one angle, we can use the tangent function:
tan(70) = AC/6
Multiplying both sides by 6, we get:
AC = 6 * tan(70)
Using a calculator, we get:
AC ≈ 19.22
Rounding to the nearest hundredth, we get:
AC ≈ 19.22 units.