Kant Pure Math? Remark I

"Pure Mathematics, and especially pure geometry, can only have objective reality on condition that they refer to objects of sense. But in regard to the latter the principle holds good, that our sense representation is not a representation of things in themselves but of the way in which they appear to us."

Kant says that math, with emphasis on geometry, have objective reality. Geometry is much more easier to show this because geometry deals primarily with shapes and figures, rather than numbers. Showing someone that a triangle has a right angle is easy when you look at something at 90degrees, rather than trying to do a formula for it.