33 questions · self-marked practice — reveal the answer and mark yourself.
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2-D figures are also called plane figures.
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The given statement is false.
For a triangle the sum of two sides should be greater than the third side.
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The solid shapes are of 3-dimensional.
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If the order of rotational symmetry of a figure is 4, then the angle of rotation must be 90°.
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The number of lines of symmetry of a regular polygon is equal to the vertices of the polygon.
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Since, the distance between the two parallel lines is always same everywhere.Solution:
The circle, the square, the rectangle and the triangle are examples of plane figures.
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Centre of rotation turns an object about a fixed point.
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Order of rotational symmetry of a semi circle is one. So the given statement is false.Solution:
Order of rotational symmetry of a rhombus is two. So the given statement is false.Solution:
Mirror reflection not always lead to symmetry.
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Isometric sheet divides the paper into small equilateral triangles made up of dots or lines.
So the given statement is false.
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In oblique sketch of the solid, the measurements are not kept proportional.
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Since, a regular polygon has many lines of symmetry as the number of its sides.
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A pyramid has atleast 4 vertices (in triangular pyramid).
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An isometric sketch always have proportional length.
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The given statement is true.
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A cone is not a polyhedron.
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Since, a circle has infinite lines of symmetry.