Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to ...

Two-dimensional (2D) shapes are completely flat. 2D shapes can be found printed in a book or on a website. 2D shapes have sides and corners. A rectangle has 4 straight sides and 4 corners.

The difference between complementary and supplementary angles boils down to the sum of two angles needed to create these shapes. Two acute angles can combine to form a right angle (complementary ...

Explore the areas two circles as they change in size. Experiment with circles that overlap, to find the different shapes that can be made. Visualise how overlapping circles relate to the shape of the ...