Question: STUDENT TASK:
► Plot KITE with vertices:
K $(0,2)$
I $(2,4)$
T $(4,2)$
E $(2,0)$
1. Reflect the kite across the y-axis.
► • Questions:
What are the coordinates of K', I', T', and E?
Which points change their sign?
What do you notice about the shape after reflection?
Graph/shape: A kite centered around the point $(2,2)$ with vertices K$(0,2)$, I$(2,4)$, T$(4,2)$, and E$(2,0)$; after reflection across the y-axis, the image is positioned to the top-left/top-right? position_hint=center
3. Rotate the original kite $90^\circ$ clockwise about the origin.
• Questions:
What are the coordinates after the rotation of K''',
I''', T''', and E'''?
Did the kite change shape or size?
What point remained the reference for the
rotation?
graph: kite shape rotated $90^\circ$ clockwise about the origin, position_hint=center
2. Translate the reflected kite:
3 units left and 2 units up
Questions:
Did the shape change in size or orientation?
What transformation rule was applied?
What are the coordinates of K'', I'', T'', and E''?
1. **State the problem:**
We have a kite with vertices $K(0,2)$, $I(2,4)$, $T(4,2)$, and $E(2,0)$. We will perform three transformations: reflection across the y-axis, rotation $90^\circ$ clockwise about the origin, and translation of the reflected kite.
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2. **Reflection across the y-axis:**
- Formula: Reflecting a point $(x,y)$ across the y-axis gives $(-x,y)$.
- Apply to each vertex:
- $K(0,2) \to K'(\cancel{0},2) = (0,2)$
- $I(2,4) \to I'(-2,4)$
- $T(4,2) \to T'(-4,2)$
- $E(2,0) \to E'(-2,0)$
3. **Which points change their sign?**
- Points with $x \neq 0$ change sign in the $x$-coordinate: $I, T, E$.
- Point $K$ remains the same because $x=0$.
4. **Shape after reflection:**
- The kite is mirrored across the y-axis.
- The shape and size remain the same, only the position changes.
---
5. **Rotation $90^\circ$ clockwise about the origin:**
- Formula: Rotating $(x,y)$ $90^\circ$ clockwise gives $(y,-x)$.
- Apply to original vertices:
- $K(0,2) \to K'''(2,0)$
- $I(2,4) \to I'''(4,-2)$
- $T(4,2) \to T'''(2,-4)$
- $E(2,0) \to E'''(0,-2)$
6. **Did the kite change shape or size?**
- No, rotation preserves shape and size.
7. **Reference point for rotation:**
- The origin $(0,0)$ is the center of rotation.
---
8. **Translation of the reflected kite:**
- Translation rule: $(x,y) \to (x-3, y+2)$ (3 units left, 2 units up).
- Apply to reflected points:
- $K'(0,2) \to K''(0-3, 2+2) = (-3,4)$
- $I'(-2,4) \to I''(-2-3, 4+2) = (-5,6)$
- $T'(-4,2) \to T''(-4-3, 2+2) = (-7,4)$
- $E'(-2,0) \to E''(-2-3, 0+2) = (-5,2)$
9. **Did the shape change in size or orientation?**
- No, translation moves the shape without changing size or orientation.
10. **Transformation rule applied:**
- Translation by vector $(-3,2)$.
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**Final answers:**
- Reflected coordinates: $K'(0,2)$, $I'(-2,4)$, $T'(-4,2)$, $E'(-2,0)$.
- Points changing sign in $x$: $I, T, E$.
- After reflection, shape is congruent but mirrored.
- Rotated coordinates: $K'''(2,0)$, $I'''(4,-2)$, $T'''(2,-4)$, $E'''(0,-2)$.
- Rotation preserves shape and size; origin is center.
- Translated reflected kite coordinates: $K''(-3,4)$, $I''(-5,6)$, $T''(-7,4)$, $E''(-5,2)$.
- Translation preserves size and orientation.