home Interactive Shape
a1 a2 a3 a4
b1 b2 b3 b4
c1 c2 c3 c4
d1 d2 d3 d4
ks1 ks3 & ks4 Foundation
ks2 ks4 Higher
ks3 & ks4 Foundation Explain why the angles in a triangle sum to 180°.
Please enable Java for an interactive construction (with Cinderella).
You could print out this page and write on the diagram.