Rhombus Lesson for Kids: Definition & Facts

Instructor: Jeremy Cook

I have been teaching elementary school for 16 years. I have extensive experience in lesson and curriculum development and educational technology.

This lesson will teach you all the attributes you need to have a rhombus. Examine how to find the perimeter and area, as well as discover some interesting things about rhombuses.

What is a Rhombus?

What kind of shape do you think you'd get if you kicked a square hard enough for it to lean a bit to one side? Don't try that at home, but that leaning square actually has a name. It's called a rhombus.

A rhombus is a four-sided polygon. A polygon is a many sided shape where the lines connect. A rhombus is in the broad category of polygons with four sides and four angles we call quadrilaterals. This group consists of common named figures such as rectangles, squares, trapezoids and parallelograms.

The yellow part of the Brazil flag is a rhombus
Rhombus Brazil

What Makes a Rhombus

To have a rhombus, there are certain things that the shape must have.

  • All four sides must be equal, which is why I talked about kicking a square. So a rhombus is like a square in that the sides are all the same length.
  • The opposite inside angles are equal.
  • The opposite sides are parallel. This makes the rhombus a special kind of parallelogram.

Finding the perimeter of a rhombus is done the same way you would any other quadrilateral; by adding up the four sides. Finding the area is different though.

Finding the Area

Because the sides are tilted, you can't multiply the length by the width like you do with a square to find the area of a rhombus. You must find the height of the rhombus and then multiply that by the length. To do that, you must draw a straight, vertical line from the top outside corner down and draw a horizontal line that extends out from the base until it meets the vertical line you drew. Then measure the vertical line from the point it meets the horizontal line you drew to the corner of the rhombus. That will give you the height. Then multiply the height times the length of either the top or bottom side.

You can see the red lines added to help make the height line for measuring area
Rhombus Height

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