**4.**a straight line that touches the outside of a curve but does not cross it**5.**“to cut”**7.**a line that goes around a circle or any other curved shape; the length of this line**9.**half of the diameter**10.**a flat shape with eight straight sides and eight angles**13.**triangle with the same side length on two sides**15.**the portion of a circle enclosed by two radii and an arc**16.**a flat shape with ten straight sides and ten angles**18.**the point where the internal angle bisectors of the triangle cross**20.**triangle with the same side length on three sides**21.**the intersections of the triangles’ medians**22.**two circles only contact on one point, and they are on the different side**25.**the set of points which are an equal distance to a fixed point**29.**of a regular polygon is a line segment from the center to the midpoint of one of its sides**31.**a flat shape with twelve straight sides and twelve angles**33.**two unparallel lines may have**34.**having four straight equal sides and four angles of 90°

**1.**a flat shape with three straight sides and three angles**2.**the angle inside two adjacent sides of a polygon**3.**two circles only contact on one point, and they are on the same side**6.**the intersections of the triangles’ angular bisectors is the center of the circle**8.**the vertexes of the triangles are all on the circle**11.**a flat shape with four straight sides**12.**a straight line going from one side of a circle or any other round object to the other side, passing through the centre**14.**180°- interior angle**17.**90°**19.**a flat shape with six straight sides and six angles**23.**polygon with the same interior angles and sides’ lengths.**24.**a flat shape with nine straight sides and nine angles**26.**dividing something into two equal parts**27.**a flat shape with at least three straight sides and angles, and usually five or more**28.**a line segment joining two points on a curve**30.**a flat shape with five straight sides and five angles**32.**a flat shape with seven straight sides and seven angles