Vertical Angles

When two lines cross each other, four angles are formed.

An angle is equal to an angle that is opposite to it. In the above image ∠a is opposite (facing) ∠c, so ∠a = ∠c.

∠b is opposite ∠d so

m ∠b = m ∠d

Furthermore, when two lines cross each other, any two angles next to each other are supplementary.

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  • Anonymous

    What the m means?

    • kiddie

      it means measure

  • Martana

    How do get the numbers for the angles?

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