Reasoning

R_BI_I3_E1_A1_fig1

A shape made up of an irregular quadrilateral in four different orientations around a point, next to a tessellation using the same shape.

Quadrilaterals around a point and a tessellation of quadrilaterals.

R_BI_I4_E2_fig1

Line of vertical bars doubling in height.

Doubling quantities.

R_BI_I5_E2_fig1

Rectangles with central points marked and straight lines drawn through the centres to divide them into halves, with corresponding sides and alternate interior angles marked as being equal.

Halving a rectangle.

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