Every year in 5th grade, when we begin classifying quadrilaterals, students will certainly continually call a rhombus a diamond. It never ever fails. When doing a i beg your pardon One Doesn’t belong in third grade yesterday, the same thing happened, therefore Christopher’s tweet came at the most perfect time! (On Desmos here: https://t.co/rZQhu2SGnR)


Of course I had to pop right into the exact same classroom this day and shot it out! The lower right to be so obviously a diamond come me that ns was curious to see if students experienced the exact same thing and also if it readjusted their reasoning around the rhombus together a diamond.

You are watching: Difference between a diamond and a rhombus

Here are photos of the SMARTboard after ours talk:

After good discussions around number of sides, rotations, decomposition and also orientation, they lastly got to the specify name piece. Honestly, I to be surprised name didn’t come up as among the very first things. It started with a student saying the square didn’t belong due to the fact that it is the only one the doesn’t look choose a diamond. The next student claimed the lower left to be the just one “that didn’t have a name.” as soon as I asked the to define further, he called the square, rhombus, and diamond. Due to the fact that I knew at the finish of our speak I want to ask about the diamond vs rhombus, I composed the names on the shapes. One more classmate included on and also 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 they thought around the surname we had actually on the board and it to be a unanimous commitment on all of them. Funny how quickly they abandoned their idea indigenous yesterday, so ns reminded them….they to be not gaining off the hook that easy;)

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

Students defined that the lower right actually looks like a actual diamond and the rhombus doesn’t now that they check out them together.

“Can we call both of lock a diamond?” ns asked. I experienced a few thinking that might be a an excellent idea. I had them turn and also talk come a ar while ns listened come them.

We came back and they seemed to agree we couldn’t contact them both a diamond since of the number of sides. Castle were yes, really confident in make the ascendancy that the quadrilateral one had actually to it is in a rhombus and the pentagon to be the diamond. Ns pointed come the kite and asked around that one, due to the fact that it has four sides. “Could we call this a rhombus?” They claimed no since the political parties weren’t equal, so not a rhombus. And because that didn’t have five sides, no a diamond either.

Thank friend Christopher! every one of these years of make the efforts to resolve that rhombus vs diamond debate settled right here with good conversation every around!

Next up, this one from Christopher…


10 think on “Rhombus vs Diamond”

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Simon Gregg February 12, 2016 in ~ 9:42 pm

How great, to switch a conversation i m sorry is commonly a matter of the teacher informing the (unconvinced) college student what the specify name convention is, right into one whereby the students do their method to this themselves.

I have tendency to protect against quadrilateral classification because it gets a little namey and boggling (rhombus is special case of kite, rhombus is special instance of parallelogram, square is special situation of rhombus the is additionally a rectangle), however this conversation takes it far from that kind of thing.

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

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howardat58 February 13, 2016 at 12:04 am

Kids do like arguing about tomatoes, together “vegetable” or “fruit”.On the various other hand castle don’t have a difficulty with “golden delicious” as a special case of “apple”.