**5.**a triangle with two equal sides**7.**the distance from the centre to the edge of a circle**8.**a quadrilateral which has only one pair of parallel sides**11.**the distance from side-to-side**12.**an instrument with two arms, one sharp and one with a pencil that can be used to draw circles**14.**a tool used to rule straight lines and measure distances**15.**a flat shape with four straight sides**18.**a 2D shape made by drawing a curve that is always the same distance from a centre**21.**triangle a triangle with all three sides of equal length

**1.**a plane closed shape (2 dimensional) with straight lines**2.**a three-sided polygon**3.**a triangle that has a right angle**4.**an instrument used in measuring of drawing angles**6.**a triangle with all sides of different lengths**9.**a quadrilateral where opposite sides are equal in length and parallel**10.**the distance around the edge of a circle**13.**a quadrilateral which has all sides of equal length and each interial angle a right angle**16.**a quadrilateral where all sides have equal length**17.**a straight line going through the centre of a circle connecting two points on the circumference**19.**a quadrilateral where all interior angles are 90 degrees and opposite sides are parallel and of equal length**20.**a quadrilateral whose four sides cn be grouped into two pairs of equal-length sides that are adjacent to each other