The Vertical Angle Theorem states that . a = 45° a = 45 °. Other examples include the point where ceiling beams intersect in a somewhat x shape, and in a kite where two wooden sticks hold it together.

"Vertical" refers to the vertex (where they cross), NOT up/down. They are always equal. Vertical Angle problems can also involve algebraic expressions. Examples of vertical angles in real life settings include the black and white railroad crossing signs found on roadways near railroads, open scissors and the letter "X." Again, we can use algebra to support what is evident in the drawings for vertical angles a a: 2a = 90° 2 a = 90 °. For example, look at the two angles in red above. Scroll down the page for more examples and solutions. Vertical angles theorem proof Put simply, it means that vertical angles are equal. Two angles are said to be supplementary angles if the sum of both the angles is 180 degrees. The following diagram shows the vertical angles formed from two intersecting lines.

The angles opposite each other when two lines cross. their sum is 180°. They have the same measure. To find the value of x, set the measure of the 2 vertical angles equal, then solve the equation: $ x + 4 = 2x-3 \\ x= 8 $ Sum of two adjacent supplementary angles = 180o. Vertical Angles are the angles opposite each other when two lines cross "Vertical" in this case means they share the same Vertex (corner point), not the usual meaning of up-down. Acute vertical angles could be complementary; you have a 1-in-45 chance of that. Vertical angles are equal. Only when vertical angles, a a, are 45° 45 ° can they be complementary. The following video explains more about vertical angles… Congruent is quite a fancy word. In this example a° and b° are vertical angles. Here are some examples of Adjacent angles: Examples of Adjacent Angles. Notice also that x and y are supplementary angles i.e. If the two supplementary angles are adjacent to each other then they are called linear pair. Example: a° and b° … Angles 1 and 2 are a linear pair, so their sum is 180 degrees; therefore, the measure of angle 2 is 180 - 115 = 65 degrees. If one of them measures 140 degrees such as the one on top, the one at the bottom is also 140 degrees. The following diagram shows another example of vertical angles. Theorem: Vertical angles are congruent. Solving With Vertical Angles Some of the worksheets for this concept are Writing equations for vertical angles, Vertical angles example, Lesson 11 angle problems and solving equations, Lesson 3 solving for unknown angles using equations, 3 parallel lines and transversals, Working with adjacent angles, Equation in vertical angle apply vertical angle property, Name the relationship complementary linear pair.


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