Two straight roads cross each other forming a junction. One of the angles at which they intersect is shown in the figure below. Find angle B (in degrees).

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Solution

$∠ B$ and the given angle $120^{\circ}$ are vertically opposite to each other. As vertically opposite angles are equal, $∠ B = 120^{\circ}$ .

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Two straight roads cross each other forming a junction. One of the angles at which they intersect is shown in the figure below. Find angle B (in degrees). ___

∠B and the given angle 120∘ are vertically opposite to each other. As vertically opposite angles are equal, ∠B=120∘.

Two straight roads cross each other forming a junction. One of the angles at which they intersect is shown in the figure below. Find angle B (in degrees).

___

$∠ B$ and the given angle $120^{\circ}$ are vertically opposite to each other. As vertically opposite angles are equal, $∠ B = 120^{\circ}$ .