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## All Questions

#### 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

(b) A brick- Cuboid

(c) A matchbox-Cuboid

#### A triangular prism looks like the shape of a Kaleidoscope. It has triangles as its bases.         Faces : _______         Edges : _______        Corners : _______

Faces =   (Two triangular faces and three square faces)

Edges = 9

Corners =

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F - 5

E - 8

C - 5

#### A triangular pyramid has a triangle as its base. It is also known as a tetrahedron.              Faces : _______             Edges : _______             Corners : _______

The number of

Faces =           (All triangular faces)

Edges =

Corners =

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3

10

7

#### 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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#### 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

#### 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

(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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#### 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

#### 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.