> Learning the relations between different geometric figures is > useful.
I think it can be see best from similarity in the text. > > Old: "A rectangle has four sides and L-shaped corners." > > New: "A rectangle has four sides and four right angles." > > > > This is getting advanced. Classifying angles is a > > part of geometry, in the 9th or 10th year of school. > > AFAICS, it's part of grade 7 in the US. > > But surely the kids have heard the term �straight angle� before? > (If not, they can learn it from Tux Paint! :) ) That's also 9th or 10th year and... it means 180 degrees! > > Old: "A rhombus has four equal sides." > > New: "A rhombus has four equal sides, and opposite sides are > > parallel." > > > > The first part is enough to define a rhombus. The second > > part requires geometry. > > No, the first part defines a quadrangle. The second part is > needed. four EQUAL sides That is a rhombus. Well, there's a degenerate "shape" with lines crossing, but maybe that is a rhombus too. > But the rhombus may as well be removed. It's just a rotated > square, and Tux Paint supports rotating. No. This was the major error that convinced me to touch that file in the first place. A rhombus with angles of 30 degrees and 60 degrees is not a rotated square. _______________________________________________ Tuxpaint-dev mailing list [email protected] http://tux4kids.net/mailman/listinfo/tuxpaint-dev
