Question

10.two lines intersect. if one angle is 70°, what is its supplementary angle?

Explanation:

Step1: Recall supplementary - angle definition

Supplementary angles add up to 180°.

Step2: Calculate the supplementary angle

Let the given angle be $\alpha = 70^{\circ}$, and the supplementary angle be $\beta$. Then $\beta=180^{\circ}-\alpha$. Substituting $\alpha = 70^{\circ}$, we get $\beta = 180^{\circ}-70^{\circ}=110^{\circ}$.

Answer:

$110^{\circ}$