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Practice each question, then open the answer or worked solution.
Out of __________ faces of a triangular prism, __________are rectangles and __________ are triangles.
Ans: A triangular prism has five faces. Out of $5$ faces of a triangular prism, $3$ are rectangles and $2$ are triangles.
The base of a triangular pyramid is a __________.
Ans: A triangular pyramid is a geometric shape that has a triangular base and three triangular faces, having a common vertex. The base of a triangular pyramid is a triangle.
Out of __________ faces of a square pyramid, __________ are triangles and __________ is/are squares.
Ans: A square pyramid is a pyramid having a square base. It has $5$ faces, $8$ edges and $5$ vertices. Out of $5$ faces of a square pyramid,$4$ are triangles and $1$ is square.
Out of __________ faces of a rectangular pyramid __________ are triangles and base is __________.
Ans: It is known that if the base of a pyramid is rectangular, then it is called a rectangular pyramid. Out of $5$ faces of a rectangular pyramid, $4$ are triangles and base is rectangle.
Each of the letters ${\mathbf{H, N, S}}$ and ${\mathbf{Z}}$ has a rotational symmetry of order __________.
Ans: A shape has Rotational Symmetry when it still looks the same after some rotation. Each of the letters ${\mathbf{H, N, S}}$ and ${\mathbf{Z}}$ has a rotational symmetry of order two.
Order of rotational symmetry of a rectangle is __________.
Ans: In a complete turn (of ${360^\circ }$ ), the number of times the figure coincides with its original position is called its order of rotational symmetry. Order of rotational symmetry of a rectangle is two.
Order of rotational symmetry of a circle is __________.
Ans: In a complete turn (of ${360^\circ }$ ), the number of times the figure coincides with its original position is called its order of rotational symmetry. Order of rotational symmetry of a circle is infinite.
Each face of a cuboid is a __________.
Ans:
From the picture of cuboid, it is clear that,
Each face of a cuboid is a rectangle.
Line of symmetry for an angle is its __________.
Ans: Line of symmetry is an imaginary line that divides the figure in two equal halves. Therefore, the line of symmetry for an angle is its bisector.
A parallelogram has __________ line of symmetry.
Ans: There is no line of symmetry of a parallelogram along its length, breadth. There is no superimposition of one half on the other when folded along its half. The diagonals are not symmetrical. Therefore, a parallelogram has no line of symmetry.