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A Amit Singh
the shape of the following things are (a) Your instrument box- Cuboid (b) A brick- Cuboid (c) A matchbox-Cuboid (d) A road-roller- Cylinder (e) A sweet laddu-Sphere

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H Harsh Kankaria
In a square pyramid, the number of Faces =           (Four triangular faces and one square face) Edges =           (Four edges of the square base and other four joining at the top)    Corners = 

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H Harsh Kankaria
 It has  faces.        (Three pairs of parallel square faces)   Each face has  edges.          Each face has  vertices

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H Harsh Kankaria
(a) all the four angles are acute.             (b) one of the angles is obtuse.             (c) one of the angles is right angled.             (d) two of the angles are obtuse.               (e) two of the angles are right angled.               (f) the diagonals are perpendicular to one another

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H Harsh Kankaria
(a) a scalene acute angled triangle. :  Scalene : All side of different length Acute angled : All angles less than    (b) an obtuse angled isosceles triangle Isosceles traingle: Only two sides are of equal length Obtuse angled : At least one angle greater than 

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H Harsh Kankaria
No, the angle is not more than than 1 right angle.  For each hour, angle made =  Therefore, when the hour hand moves from 5 to 7, the angle made = 

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H Harsh Kankaria
Yes, the revolution of the hour hand is more than 1 right angle. For each hour, angle made =  Therefore, when the hour hand moves from 12 to 5, the angle made = 

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H Harsh Kankaria
(a) One fourth revolution: From (b) Half revolution: From (c) Three fourth revolution: From (d) Three fourth revolution: From (e) Half fourth revolution: From  

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H Harsh Kankaria
One-fourth revolution =  The angle name for one-fourth revolution is "Right Angle"

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H Harsh Kankaria
Half a revolution =  The angle name for half a revolution is "Straight Angle".
(a) Cone                                                  (ii)           (b) Sphere                                               (iv)          (c) Cylinder                                              (v)        (d) Cuboid                                             (iii)        (e) Pyramid                                            (i)       
We have drawn the pentagon ABCDE and by joining its vertices he has drawn the diagonals AC, CE, EB, BD and DA.
We have made the regular octagon ABCDEFGH and by joining vertices H, C, D and G we have formed the rectangle HCDG
We have drawn the regular Hexagon ABCDEF and by joining the vertices B, D and F we have formed the Equilateral Triangle BDF.
(a) The given figure is not a polygon as it is not a closed figure. (b) The given figure is  a polygon. (c) The given figure is not a polygon as a polygon is enclosed only by line segments. (d) The given figure is not a polygon as a polygon is enclosed only by line segments.
Square is the only quadrilateral with sides equal in length and angles equal in measure, therefore, a square is the regular quadrilateral.
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