RS Aggarwal Vikash Aggarwal Class 4 Activity Book Composite Mathematics Activity Sheet 72 Solution
Activity Sheet – 72
Fill in the blanks:
(1) The sides of a polygon having a common vertex are called its adjacent sides.
(2) A line-segment joining the non-adjacent vertices of a polygon is called its diagonal.
(3) A rectangle is a quadrilateral in which opposite sides are equal.
(4) A square is a quadrilateral in which all sides are equal.
(5) Every point on the circle is equidistant from its centre.
(6) We use a compass to draw a circle.
(7) The point at which the adjacent sides of a polygon meet is called its vertex.
(8) Diameter is the longest chord of a circle.
(9) The perimeter of a circle is called its circumference.
(10) All the radii of a circle are equal.
(11) Diameter of a circle is twice.
(12) A cuboid has 6 faces, 8 vertices and 12 edges.
(13) Each face of a cube is a square.
(14) A triangular pyramid has 4 triangular faces, 4 vertices and 6 edges.
(15) A square pyramid has 1 square face, 4 triangular faces, 5 vertices and 8 edges.
(16) A cone has one vertex while a cylinder has none.
(17) A square has four lines of symmetry.
(18) A circle has infinite line of symmetry.
(19) A triangle with all sides equal has 3 lines of symmetry.
(20) The sum of all the sides of a rectilinear figure is called its perimeter.
(21) The perimeter of a square is 4 times the length of its side.
(22) Perimeter of a rectangle = Length x Breadth
(23) A line segment has 2 end-points, a ray has 1 while a line has 0