Geometry is the basis for trigonometry, which is the building block for calculus. You have to understand the angles of a triangle to get to sine, cosine, and tangent. Many college majors require math, even those your might not expect, and you don't always know ahead of time what major your child will choose 4 years from now. That's why I think that math is important - and that includes geometry.The geometry most of us remember from high school is "formal" geometry with proofs. Saxon approaches geometry in a more integrated fashion, combining it with other discipline - mixing it up a bit.
Our engineering professor friend says that there is a huge and growing deficit of kids that can do math - which has led to a decline in engineers and scientists. This is something they talk about at their professional engineering conventions, because it's a huge problem nationwide that affects our national security and national economy. This is something that engineers get very worked up about it :-) See more of my friend's comments here
If your child gets frustrated by words, have them look at Saxon for math. It's mostly numbers, which can sometimes be encouraging to kids that hate reading and writing.
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