Fill in the blanks: (a) A curve which ends at the starting point is called a __. (b) A point where two sides of a polygon meet is called a . (c) A polygon formed by 6 line segments is called a . (d) Squares and rectangles are special __.

Step 1: Identify figure (أ) - square. Count the sides: there are 4 straight lines forming the boundary. Count the vertices: there are 4 corner points. 4 sides, 4 vertices Step 2: Identify figure (ب) - pentagon. Count the sides: there are 5 straight lines forming the boundary. Count the vertices: there are 5 corner points. 5 sides, 5 vertices Step 3: Identify figure (ج) - triangle. Count the sides: there are 3 straight lines forming the boundary. Count the vertices: there are 3 corner points. 3 sides, 3 vertices Step 4: Name the polygon with 3 sides. A polygon with 3 sides is a triangle. مثلث or triangle Step 5: Name the polygon with 4 sides. A polygon with 4 sides is a quadrilateral. رباعي الأضلاع or quadrilateral Step 6: Polygon with two parallel sides. This is a trapezoid. شبه متوازي الأضلاع or trapezoid Step 7: Polygon with 4 equal sides and 4 right angles. This is a square. مربع or square