Every year in fifth grade, as soon as we start classifying quadrilaterals, students will continually call a rhombus a diamond. It never fails. While doing a i beg your pardon One Doesn’t belong in 3rd grade yesterday, the very same thing happened, so Christopher’s tweet come at the most perfect time! (On Desmos here: https://t.co/rZQhu2SGnR)


Of course I had actually to pop right into the exact same classroom this particular day and try it out! The reduced right was so clear a diamond to me that ns was curious to view if students observed the very same thing and if it adjusted their reasoning around the rhombus together a diamond.

You are watching: What is the difference between a diamond and a rhombus

Here are photos of the SMARTboard after our talk:

After good discussions around number of sides, rotations, decomposition and also orientation, they finally got come the specify name piece. Honestly, I to be surprised surname didn’t come up as among the first things. It started with a college student saying the square didn’t belong because it is the just one that doesn’t look prefer a diamond. The following student said the lower left to be the just one “that didn’t have a name.” when I asked the to explain further, he called the square, rhombus, and diamond. Because I knew at the end of our speak I wanted to ask about the diamond vs rhombus, I composed the name on the shapes. An additional classmate added on and said the reduced left “may not have actually a name but it is kite-shaped and also looks favor it got stuck in a tree sideways.” ns asked the class what castle thought around the name we had actually on the board and it to be a unanimous agreement on all of them. Funny how easily they abandoned your idea from yesterday, so ns reminded them….they were not obtaining off the hook that easy;)

“Yesterday you were calling this rhombus a diamond, what changed your mind?”

Students defined that the lower right actually looks like a actual diamond and also the rhombus doesn’t currently that they view them together.

“Can we contact both of lock a diamond?” i asked. I saw a couple of thinking that might be a an excellent idea. I had actually them turn and talk come a neighbor while ns listened to them.

We came back and they appeared to agree we couldn’t call them both a diamond since of the variety of sides. Lock were yes, really confident in make the ascendancy that the square one had actually to be a rhombus and also the pentagon to be the diamond. I pointed to the kite and asked around that one, since it has 4 sides. “Could we call this a rhombus?” They said no because the sides weren’t equal, so no a rhombus. And because the didn’t have five sides, no a diamond either.

Thank friend Christopher! all of these year of make the efforts to clear up that rhombus vs diamond debate worked out right below with great conversation all around!

Next up, this one indigenous Christopher…


10 thoughts on “Rhombus vs Diamond”

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Simon Gregg February 12, 2016 at 9:42 pm

How great, to move a conversation i beg your pardon is generally a matter of the teacher telling the (unconvinced) college student what the naming convention is, right into one wherein the students do their way to this themselves.

I have tendency to protect against quadrilateral classification since it gets a small namey and boggling (rhombus is special situation of kite, rhombus is special case of parallelogram, square is special situation of rhombus that is likewise a rectangle), but this conversation takes it far from that type of thing.

I wonder why Christopher chose a square together his rhombus, quite than one without equal angles? If it to be “thinner” it would look diamondy.

See more: All Right Angles Are Congruent., True Or False: All Right Angles Are Congru

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howardat58 February 13, 2016 in ~ 12:04 am

Kids carry out like arguing about tomatoes, together “vegetable” or “fruit”.On the other hand lock don’t have actually a trouble with “golden delicious” as a special situation of “apple”.