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Practice each question, then open the answer or worked solution.
Two dimensional figures are also called plane figures.
Ans: Two-dimensional figure is a figure that lies completely in one plane.
So, two dimensional figures are also known as plane figures.
Therefore, the given statement is True.
A cone is a polyhedron.
Ans: Polyhedrons are ${\text{3 - D}}$ figures with rectangular bases.
So, a cone is not a polyhedron.
Therefore, the given statement is False.
A prism has four bases.
Ans: A prism has only one base.
Therefore, the given statement is False.
The number of lines of symmetry of a regular polygon is equal to the vertices of the polygon.
Ans: It is true that the number of lines of symmetry of a regular polygon is equal to the vertices of the polygon.
Therefore, the given statement is True.
The order of rotational symmetry of a figure is ${\mathbf{4}}$ and the angle of rotation is ${\mathbf{180^\circ }}$ only.
Ans: If the order of rotational symmetry of a figure is $4$ then the angle of rotation must be ${90}^{\circ} $ only.
Therefore, the given statement is False.
After rotating a figure by ${\mathbf{120^\circ }}$ about its center, the figure coincides with its original position. This will happen again if the figure is rotated at an angle of ${\mathbf{240^\circ }}$.
Ans: It is true that after rotating a figure by $120^\circ $ about its center, the figure coincides with its original position. This will happen again if the figure is rotated at an angle of $240^\circ $.
Therefore, the given statement is True.
Mirror reflection leads to symmetry always.
Ans: Mirror reflection does not always lead to symmetry.
Therefore, the given statement is False.
Rotation turns an object about a fixed point which is known as the center of rotation.
Ans: The fixed point is the center of rotation. And the angle by which the object rotates is the angle of rotation.
Therefore, the given statement is True.
Isometric sheet divides the paper into small isosceles triangles made up of dots or lines.
Ans: Isometric sheet divides the paper into small equilateral triangles made up of dots or lines.
Therefore, the given statement is False.
The circle, the square, the rectangle and the triangle are examples of plane figures.
Ans: A plane figure is a flat figure with closed lines that stays in a single plane. The lines of the figure can be straight, curved or a combination. Some examples of plane figures are triangles, rectangles, squares, rhombuses, parallelograms, circles, ovals, hearts, pentagons and hexagons.
Therefore, the given statement is True.