Rohini made this shape. Mohini - Is it a closed shape or an open shape ? Rohini - It is a closed shape. Mohini - How many sides are there ? Rohini - It has 6 sides. Mohini made this. But it is not the same as the one made by Rohini. So Mohini tried again. This is what she made. Is there some way to say in what way these shapes are different ?

Given, A shape which is closed and has 6 sides. The shape made by Mohini has two closed shapes connected with each other. There are two triangles. But the shape made by Rohini is one closed shape. The name of the shape is Hexagon. The two shapes also differ in terms of the angles inside the shape. Hence, the two shapes are different.

Look at the angle in the picture and fill the table. Angle Right angle More than a right angle Less than a right angle

Given, The picture with angle marked. The angle bounded by two lines perpendicular to each other i.e. 90 ° is known as right angle. Thus, observing from the picture it is a right angle. Angle Right angle More than a right angle Less than a right angle Thus, the table is filled with the required answer.

Study the given figure carefully and match the following. Column I Column II (a) ∠ AOB ( i ) Straight angle (b) ∠ AOE ( i i ) Acute angle (c) ∠ AOC ( i i i ) Right angle (d) ∠ BOD ( i v ) Obtuse angle

(a)- ( i i ) ; (b)- ( i i i ) ; (c)- ( i v ) ; (d)- ( i )

(a)- ( i ) ; (b)- ( i v ) ; (c)- ( i i ) ; (d)- ( i i i )

(a)- ( i i ) ; (b)- ( i ) ; (c)- ( i i i ) ; (d)- ( i v )

(a)- ( i ) ; (b)- ( i i ) ;(c)- ( i i i ) ; (d)- ( i v )

Some angles are shown below: Which is the smallest and largest among these?

From the figure given in the question, We know that, Angles are formed by two rays lie in the plane having common end point. We observe that, ∠ OMN is the obtuse angle which is the largest angle among all the given angles. ∠ GHI is the acute angle, which is the smallest angle among all given angles. Hence, the largest angle is ∠ OMN and the smallest angle is ∠ GHI.

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The common end point is called the of an angle.

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Important Questions on Geometric Constructions

MEDIUM

Mathematics>Geometry>Geometric Constructions>Lines and Angles

On a clock, there are two instants between

12

noon and

1

PM, when the hour hand and the minute hand are at right angles. The difference in minutes between these two instants is written as

a + \frac{b}{c},

where

a, b and c

are positive integers, with

b < c

and

\frac{L}{c}

in the reduced form. What is the value of

a + b + c ?

HARD

Mathematics>Geometry>Geometric Constructions>Lines and Angles

Write the total number of angles in the figure.

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HARD

Mathematics>Geometry>Geometric Constructions>Lines and Angles

Find out how many angles are there in the shape. Mark them.

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HARD

Mathematics>Geometry>Geometric Constructions>Lines and Angles

Rohini made this shape.

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Mohini - Is it a closed shape or an open shape $?$

Rohini - It is a closed shape.

Mohini - How many sides are there $?$

Rohini - It has $6$ sides.

Mohini made this.

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But it is not the same as the one made by Rohini. So Mohini tried again.

This is what she made.

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Is there some way to say in what way these shapes are different $?$

HARD

Mathematics>Geometry>Geometric Constructions>Lines and Angles

Write $3$ names using straight lines and count the angles.

MEDIUM

Mathematics>Geometry>Geometric Constructions>Lines and Angles

Name the angles you see in the figure,

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MEDIUM

Mathematics>Geometry>Geometric Constructions>Lines and Angles

Look at the angle in the picture and fill the table.

Angle	Right angle	More than a right angle	Less than a right angle

MEDIUM

Mathematics>Geometry>Geometric Constructions>Lines and Angles

Four different angles are marked in four colours. Can you find other angles which are the same as the one marked in red $?$ Mark them in red. Do this for the other colours.

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