Check out at this trapezoid. 👇
There are a few different ways we can change it. 😎
We can:
In this lesson, let's learn about three ways to move, or transform, a shape.
The ways are called translation, reflection, and rotation.
Look at this triangle.
Now, imagine that you slide the triangle on the surface of this screen.
Sliding a shape from one position to another, is called translation.
In translation, all points on the shape move the same distance, in the same direction.
There is no rotating, resizing, or anything else, just moving. ✅
Some more examples translations are shown below.
Let's use the same triangle.
This time, let's flip the triangle about the dotted line shown below, so that it moves to its new position, and appears backwards.
Flipping a shape is called reflection.
The line about which a shape is reflected is called the line of reflection, or the axis of reflection. ✅
Some more examples of reflection are shown below.
👉 All around us, we can see reflections in mirrors and in water.
Let's look at our triangle one more time.
This time, let's imagine that you turn the triangle around a fixed center.
When you stop, the triangle will have moved to a new position, and it would have turned a certain angle, such as 45°, 90° or 180°.
Here, the triangle was rotated 110° around the point marked "X".
Moving around a fixed point is called rotation.
👉 Some more examples of rotation are shown below. The "X" marks the center of rotation.
👉 In real life, we can see rotations in the hands of clocks, in merry-go-rounds, and in pinwheels.
Congratulations! 👏
You now know how to move objects using translation, reflection, and rotation. Start your practice below. 👇