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Q2. What shape is (a) Your instrument box? (b) A brick? (c) A matchbox? (d) A road-roller? (e) A sweet laddu?

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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Posted by

Amit Singh

     A triangular prism looks like the shape of a Kaleidoscope. It has triangles as its bases.

         Faces : _______

         Edges : _______

        Corners : _______

        

Faces =  5 (Two triangular faces and three square faces)

Edges = 9    

Corners = 6

        

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Posted by

HARSH KANKARIA

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     A square pyramid has a square as its base.

         Faces : _______

         Edges : _______

         Corners : _______

         

F - 5 

E - 8

C - 5

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Posted by

Subhashree Panda

    A triangular pyramid has a triangle as its base. It is also known as a tetrahedron.

              Faces : _______

             Edges : _______

             Corners : _______

             

The number of

Faces = 4          (All triangular faces)

Edges = 6             

Corners = 4

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Posted by

HARSH KANKARIA

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     A cube is a cuboid whose edges are all of equal length.

           It has ______ faces.

          Each face has ______ edges.

          Each face has ______ vertices.

         

3

10

7

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Posted by

Putshs

    Using four unequal sticks, as you did in the above activity, see if you can form a quadrilateral such that

             (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

(f) the diagonals are perpendicular to one another

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Posted by

R Renga Harish

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     Place a pair of unequal sticks such that they have their end points joined at one end. Now place another such pair meeting the             free ends of the first pair. What is the figure enclosed? It is a quadrilateral, like the one you see here. The sides of the                      quadrilateral are AB, BC , ___, ___. There are 4 angles for this quadrilateral. They are given by ∠BAD, ∠ADC, ∠DCB and _____.            BD is one diagonal. What is the other? Measure the length of the sides and the diagonals. Measure all the angles also.

            

The sides of the quadrilateral are AB, BC, CD, DA

The angles are given by \angle BAD, \angle ADC, \angle DCB \ and\ \underline{\angle ABC}

The other diagonal is AD.

 

 

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Posted by

HARSH KANKARIA

     Try to draw rough sketches of

            (a) a scalene acute angled triangle.

            (b) an obtuse angled isosceles triangle.

(a) a scalene acute angled triangle. : 

Scalene : All side of different length

Acute angled : All angles less than 90^{\circ}

 

(b) an obtuse angled isosceles triangle

Isosceles traingle: Only two sides are of equal length

Obtuse angled : At least one angle greater than 90^{\circ}

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Posted by

HARSH KANKARIA

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Q 5.     List five other situations where reflex angles may be seen.

 

Reflex angles are those angles whose measure is greater than 180o. Examples where we can see reflex angles:

1. Pizza

2. Electric pole

3. Prism 

4. Sea-saw 

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Posted by

Satyajeet Kumar

Q 4.     Find five situations where obtuse angles are made.

 

Obtuse angle examples

The open book kept for reading, Wide open cupboard door, Rooftop, Clock showing 8 o’clock, base of a Tripod. 

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Posted by

Satyajeet Kumar

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