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Shape Shifts

A Grade 8 geometry lesson covering coordinate plane translations, algebraic arrow notation, and rigid motion properties.

JDJenna Dzioba

Shape Shifts

A Grade 8 geometry lesson covering coordinate plane translations, algebraic arrow notation, and rigid motion properties.

JDJenna Dzioba
\(B'(4,\, 1)\)
\(C(-1,\, 1)\)\(-1 + 5 = \mathbf{4}\)\(1 - 3 = \mathbf{-2}\)\(C'(4,\, -2)\)

Reglas de Oro de las Traslaciones

  • • Figuras Congruentes: Lados y ángulos mantienen la misma medida.
  • • Conserva Orientación: La figura se desliza; no rota ni se refleja.
  • • Signo Prima: Siempre etiqueta la imagen transformada con primas (\(A', B', C'\)).

¡Atención! Errores Comunes

  • • Confusión de Ejes: \(x\) es izquierda/derecha; \(y\) es arriba/abajo.
  • • Cambios de Signo: "Izquierda" y "Abajo" significan restar (\(-\)).
  • • Valores Negativos: Cuidado con los signos: \(-4 + 5 = +1\), no \(-9\).
Pre-Image / PreimagenShow Substitution / ProcedimientoImage / Imagen
\(A(-4,\, 2)\)\(A'(\quad\quad,\quad\quad)\)
\(B(-1,\, 6)\)\(B'(\quad\quad,\quad\quad)\)
\(C(2,\, 1)\)\(C'(\quad\quad,\quad\quad)\)

Turn over for Part C & D • Pasa a la siguiente página Page / Página 1 of 2

Translations Quiz • Prueba de Traslaciones

Part C & D: Graphing, Rules & Error Analysis • Gráfica, Reglas y Análisis

Name / Nombre:

Page / Página 2 of 2

C Part C: Graphing on the Coordinate Plane / Gráfica en el Plano Cartesiano

1 Question • 5 Points

5. Graph \(\triangle JKL\) and its image under the translation rule: \((x, y) \to (x + 4,\, y - 5)\)

(5 pts)

Grafica el \(\triangle JKL\) y su imagen bajo la regla de traslación dada:

Pre-Image / Preimagen:

  • • \(J(-5,\, 3)\)
  • • \(K(-2,\, 4)\)
  • • \(L(-3,\, 1)\)

Image Coordinates / Coordenadas de la Imagen:

\(J':\) \((\quad\quad,\quad\quad)\)

\(K':\) \((\quad\quad,\quad\quad)\)

\(L':\) \((\quad\quad,\quad\quad)\)

• Plot and connect both triangles.

• Label all vertices with primes (\(J', K', L'\)).

• Traza y rotula ambas figuras con sus primas.

x y -4 -2 2 4 4 2 -2 -4 0

D Part D: Finding the Rule & Error Analysis / Regla y Análisis de Errores

2 Questions • 5 Points

6. A point \(M(3,\, -2)\) is translated to its image \(M'(-2,\, 4)\).

(2 pts)

Un punto \(M(3,\, -2)\) se traslada a su imagen \(M'(-2,\, 4)\).

a. Describe in words / En palabras:

Shift:

Ej: __ unidades a la der./izq., __ arriba/abajo

b. Arrow Notation / Notación de Flechas:

\((x, y) \to (\) , \()\)

7. Error Analysis: Mateo says that translating \(W(-4,\, 6)\) with the rule \((x,y) \to (x-3,\, y-2)\) results in \(W'(-1,\, 4)\).

(3 pts)

Análisis de Error: Mateo dice que al trasladar \(W(-4,\, 6)\) con la regla \((x,y) \to (x-3,\, y-2)\), la imagen es \(W'(-1,\, 4)\).

Explain Mateo's mistake / Explica el error de Mateo:

Correct Image Coordinates / Coordenadas Correctas: \(W'(\quad\quad,\quad\quad)\)

Check your signs and arithmetic carefully! • ¡Revisa tus signos y cálculos!

Shape Shifts Geometry

  • • \(L'(1,\, -4)\)  (\(-3+4,\, 1-5\))
  • Scoring Rubric (5 pts):

    • Correct calculated coordinates: 2 pts

    • Pre-image \(\triangle JKL\) plotted & connected: 1 pt

    • Image \(\triangle J'K'L'\) plotted & connected: 1 pt

    • Vertices labeled with primes: 1 pt

    x y -4 -2 2 4 4 2 -2 -4 J(-5, 3) K(-2, 4) L(-3, 1) J'(-1, -2) K'(2, -1) L'(1, -4)

    D Part D: Finding the Rule & Error Analysis Solutions

    5 Points Total

    6. From \(M(3,\, -2)\) to \(M'(-2,\, 4)\)

    2 Points

    a. In Words (1 pt):

    Shift 5 units left, 6 units up

    5 unidades a la izquierda, 6 unidades hacia arriba

    b. Arrow Notation (1 pt):

    \((x, y) \to (x - 5,\, y + 6)\)

    \(x: -2 - 3 = -5;\quad y: 4 - (-2) = +6\)

    7. Mateo's Error Analysis: \(W(-4,\, 6)\) with \((x,y) \to (x-3,\, y-2)\)

    3 Points

    Explanation of Mistake (2 pts):

    Mateo made a sign error when subtracting: he calculated \(-4 - 3 = -1\) (adding \(3\) instead of subtracting \(3\)). Subtracting a positive from a negative moves further left on the number line: \(-4 - 3 = -7\). His \(y\)-calculation was correct (\(6 - 2 = 4\)).

    Mateo sumó 3 en lugar de restar 3 en el eje \(x\). El cálculo correcto es \(-4 - 3 = -7\). Su cálculo en el eje \(y\) (\(6 - 2 = 4\)) fue correcto.

    Correct Image Coordinates (1 pt): \(W'(-7,\, 4)\)

    Grading Scale: 23-25: A (Exceeds) • 20-22: B (Proficient) • 17-19: C (Developing)

    Shape Shifts Geometry

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