Checking the surface area of a sphere
Did you ever have to wrap a basketball as a present? To see how the surface area of a sphere is really 4πr2, find a ball to wrap (a basketball works well). Cut some [...]
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07, 2017
29
07, 2017
Painting bilateral symmetry project
A painting with bilateral symmetry - made using mirroring in a paint program To see what bilateral symmetry is, paint a picture. Take a sheet of paper and fold it [...]
29
07, 2017
Diameter of a circle – Geometry
The geometry of a circle The diameter of a circle is the distance across the circle at the widest part of the circle. The diameter is always equal to twice the radius of the [...]
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07, 2017
What is a cylinder? Simple geometry
This is a cylinder. What can you find around your house that's a cylinder? A cylinder is a circle moved through space to make a solid form. The ends are circles that [...]
29
07, 2017
What is a cube? Simple geometry
Do you know how to do a Rubik's cube? A cube is a square moved through space, so it gets thicker. All cubes have six sides - the top, the bottom, and [...]
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07, 2017
Volume of a cone – Geometry
How much ice cream fits inside this cone? A cone is the set of all the line segments that start from one circle and go to a point not on the circle. You could think of [...]
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07, 2017
Circumference of a circle – Geometry
The geometry of a circle, with circumference labelled What is the circumference? The circumference of a circle is the distance all the way around the circle. It's the same as the perimeter, but [...]
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07, 2017
Proof for the area of a circle
Proof for the area of a circle: Divide a circle up into sections like an orange Euclid's proof We know it's true that A=πr-squared is the area of a circle, but how can we prove [...]
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07, 2017
Definition of a circle – Geometry
A circle is the set of points on a plane that are all the same distance away from a center point. A circle is the set of points on a plane that are all [...]
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07, 2017
Bilateral symmetry – Geometry
A butterfly has bilateral symmetry. Thanks to Wikimedia Commons What is bilateral symmetry? A shape has bilateral symmetry when it is the same on both sides of a line drawn [...]
