During a ‘start of topic’ shape lesson on Monday we had the challenge of naming 20 2D shapes. After we had completed the obvious, and a few that we wracked our brains to remember the proper names for, we began using their imaginations. Here we got things like ‘star’ or ‘arrow head’ which lead us to describe shape families and regular/irregular shapes. We concluded a 5 point star would be a decagon, as it has 10 sides, and an arrowhead would be an inverted kite and part of the quadrilaterals family. Then someone suggested a heart shape…
First we started with, what properties would a heart have? 2 sides? Ok, what other shapes have 2 sides? Then, the suggestion of a semi-circle – good thinking so far! Next, the question ‘Is a heart an irregular semi-circle?’ And from here we have had a long and detailed debate, clarifying our understanding of shape vocabulary and challenging what we knew.
If you are interested you can look at our Padlet wall here showing some of our thinking. We know that not all of our information is accurate but it’s all learning!
Our main questions were:
- Is a heart a 2D shape? Or just one line that meets?
- If a heart is a 2D shape, what properties does it have to have?
- Is a heart like a semi-circle as they both have 2 sides?
- Is a heart like a circle that’s been squashed (irregular), even though it has 2 sides?
- Does a heart belong to a shape family like a rectangle belongs to quadrilaterals?
- Does a typical heart have one vertex? The vertex at the top is a reflex angle so it might be the opposite of a vertex, or an inverted vertex.
- Can you measure an angle of the two lines that meet are curved?
- If you can’t measure an angle on a curved line, can you say that a heart has 2 vertices?
- If the circumference of a circle is ‘the linear difference around the edge of a closed curve’ then that could surely be applied to a heart shape as well? If it can, then are we saying a heart is related to a circle or perhaps an irregular type of circle?
If you have any answers, or opinions, about our discussions and our questions we would love to hear what you think! Please leave us a comment.