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Part of the problem is that professional development, both pre-service and in-service, does little to build teachers' understanding of how their discipline is used, singularly and in combination with others, to help solve problems and innovate beyond school walls. It's the rare geometry teacher who knows how architects, carpenters, bricklayers, and tile setters use the 3-4-5 triangle in construction technology. 

drop sand into pictures - makes lots of triangles - could have students print and measure their angles. click c- change color e- erase

Perimeter and Area Formulas for two dimensional 2D geometrical figures like square, Rhombus, trapezium, triangle, ellipse, segment of a circle

Challenging mathematics problems for school years 6-8