1. **State the problem:** We need to find the length of segment $|DAB|$ using trigonometry. 2. **Identify the triangle and known elements:** Assume $DAB$ is a triangle or a segment in a triangle where we know some angles and/or side lengths. 3. **Formula used:** The Law of Cosines or Law of Sines is typically used to find unknown sides in triangles. - Law of Cosines: $$c^2 = a^2 + b^2 - 2ab\cos(C)$$ - Law of Sines: $$\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}$$ 4. **Apply the appropriate formula:** Without specific values, the general approach is: - If two sides and the included angle are known, use Law of Cosines. - If one side and two angles are known, use Law of Sines. 5. **Intermediate work:** Suppose we know sides $a$, $b$ and angle $C$ opposite side $c$ (which is $|DAB|$), then: $$c = \sqrt{a^2 + b^2 - 2ab\cos(C)}$$ 6. **Explanation:** This formula calculates the length of side $c$ by considering the lengths of sides $a$ and $b$ and the angle $C$ between them. 7. **Final answer:** Substitute the known values into the formula to compute $|DAB|$. Since no specific values are given, this is the method to find $|DAB|$ using trigonometry.