**2.**90°**4.**having four straight equal sides and four angles of 90°**6.**the intersections of the triangles’ medians**7.**a flat shape with at least three straight sides and angles, and usually five or more**9.**a flat shape with four straight sides**13.**a line that goes around a circle or any other curved shape; the length of this line**14.**a flat shape with six straight sides and six angles**17.**triangle with the same side length on two sides**23.**a flat shape with five straight sides and five angles**24.**“to cut”**25.**triangle with the same side length on three sides**27.**a flat shape with twelve straight sides and twelve angles**30.**a line segment joining two points on a curve**32.**a flat shape with eight straight sides and eight angles**33.**half of the diameter**34.**a flat shape with ten straight sides and ten angles

**1.**two unparallel lines may have**3.**180°- interior angle**5.**of a regular polygon is a line segment from the center to the midpoint of one of its sides**8.**the point where the internal angle bisectors of the triangle cross**10.**two circles only contact on one point, and they are on the same side**11.**the intersections of the triangles’ angular bisectors is the center of the circle**12.**the portion of a circle enclosed by two radii and an arc**15.**a flat shape with seven straight sides and seven angles**16.**a flat shape with three straight sides and three angles**18.**a flat shape with nine straight sides and nine angles**19.**the vertexes of the triangles are all on the circle**20.**a straight line that touches the outside of a curve but does not cross it**21.**polygon with the same interior angles and sides’ lengths.**22.**two circles only contact on one point, and they are on the different side**26.**the angle inside two adjacent sides of a polygon**28.**a straight line going from one side of a circle or any other round object to the other side, passing through the centre**29.**the set of points which are an equal distance to a fixed point**31.**dividing something into two equal parts