Maths: Age 12

8 illustrated Maths lessons for Age 12.

Three corners make a straight line If you tear the three corners off any paper triangle and put their tips together, they fit perfectly along a s…
Three corners on a ruler edge Take the three corners of any paper triangle and lay them side by side on a straight edge. Together they fill …
Triangle Corners on a Ruler The three corner angles of any triangle always fit together to make a straight line, which is 180°. If you kno…
Two Discs and a Shape Row Two cardboard discs turn around a central pin. A pointer lines up a shape on the outer rim with a shape on the…
Torn Corners on a Ruler A paper triangle has its three corners torn off. Along a ruler, the three corners meet to make a straight line…
Orb Web Geometry An orb web is built from straight lines that radiate from a center and a spiral that crosses them. The spider …
Triangle Angles on a Line The three angles of a triangle can be placed together. They then form a straight line, which is 180 degrees.…
Triangle and Rectangle A rectangle can be split along a diagonal into two equal triangles. The area of one triangle is half the area …