When 2 lines cross, 2 pairs of vertical angles are formed. what is the sum of all 4 angles? . a.. 180°. b.. 270°. c.. 360°. d.. 540°.

see the attached figure to better understand the problem

In the figure

Angle A and Angle B are vertical angles

so

∠A=∠B

Angle C and Angle D are vertical angles

so

∠C=∠D

Angle A and Angle C are supplementary angles

so

∠A+∠C=

Angle D and Angle B are supplementary angles

so

∠D+∠B=

therefore

∠A+∠C+∠D+∠B=

the answer is the option C

- 70

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