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Naming Parts of Shapes

Naming Parts of Shapes. Page 81. A Point. Named by using a single capital letter Example: Points A, B, and C. Prime Notation. When a shape is transformed, the new shape is named using prime notation Example: The new

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Naming Parts of Shapes

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  1. Naming Parts of Shapes Page 81

  2. A Point • Named by using a single capital letter Example: Points A, B, and C

  3. Prime Notation • When a shape is transformed, the new shape is named using prime notation Example: The new point A is labeled as A’ (read as “A ↓ prime”) ↓

  4. Line Segment • Named by naming its endpoints and placing a bar above them Example: , , , , ,

  5. Line • Lines extend infinitely in either direction • Named by naming two points on a line and placing a bar with arrows above them Example: , , , , ,

  6. Angle • Named by using an angle symbol in front of the name of the angle’s vertex • Example: A is the angle measuring 80°

  7. Angle • Sometimes a single letter isn’t enough. • When more than one angle share a vertex, The angle is named with 3 letters (using the vertex as the middle letter) Example: HGI or IGH are referring to the angle measuring 10°

  8. Angle’s Measure • To refer to an angle’s measure, place m in front of the angle’s name Example: m HGI=10° means “the measure of HGI is 10°”

  9. Transversal • A line that crosses two or more lines • Example: is a transversal

  10. Vertical Angles • Two opposite angles formed by two intercepting lines • Always have equal value (congruent) • Example: c and d are a pair of vertical angles

  11. Corresponding Angles • Lie at the same position but different points of intersection of the transversal • Congruent IF the lines intersecting the transversal are parallel • Example: d and m are corresponding angles (both to the right of transversal and above the intersecting line)

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