The winter sky has some brightly lit star patterns visible this month, including a triangle featuring Mars at one of its points, making it worthwhile to brave the winter temperatures for stargazing.

When he pinched two adjacent triangles together and pushed the opposite vertex of the hexagon toward the center, the hexagon would open out again, like a budding flower, and show a completely new ...

Big Idea – We can describe, measure, and compare spatial relationships. to build on students' knowledge of triangle and to develop students' reasoning with properties of triangle to develop students' ...