This task depends on groups working collaboratively, discussing and
reasoning to agree a final product.
A kite shaped lawn consists of an equilateral triangle ABC of side 130 feet and an isosceles triangle BCD in which BD and CD are of length 169 feet. A gardener has a motor mower which cuts strips of. . . .
Introducing a geometrical instrument with 3 basic capabilities.
M is any point on the line AB. Squares of side length AM and MB are
constructed and their circumcircles intersect at P (and M). Prove
that the lines AD and BE produced pass through P.
How does shape relate to function in the natural world?
We're excited about this new program for drawing beautiful mathematical designs. Can you work out how we made our first few pictures and, even better, share your most elegant solutions with us?
This article gives an wonderful insight into students working on the Arclets problem that first appeared in the Sept 2002 edition of the NRICH website.
The largest square which fits into a circle is ABCD and EFGH is a square with G and H on the line CD and E and F on the circumference of the circle. Show that AB = 5EF.
Similarly the largest. . . .
This is the first article in a series which aim to provide some insight into the way spatial thinking develops in children, and draw on a range of reported research. The focus of this article is the. . . .
A task which depends on members of the group working
collaboratively to reach a single goal.
For teachers. About the teaching of geometry with some examples
from school geometry of long ago.
Keep constructing triangles in the incircle of the previous triangle. What happens?
What can you say about the lengths of the sides of a quadrilateral whose vertices are on a unit circle?
How efficiently can various flat shapes be fitted together?
Making a scale model of the solar system