Question 4
Fill in the blanks:
$\begin{matrix} S h a p e & C e n t r e o f R o t a t i o n & O r d e r o f R o t a t i o n & A n g l e o f R o t a t i o n S q u a r e R e c t a n g l e R h o m b u s E q u i l a t e r a l t r i a n g l e R e g u l a r h e x a g o n C i r c l e S e m i - c i r c l e \end{matrix}$

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Solution

$\begin{matrix} S h a p e & C e n t r e o f R o t a t i o n & O r d e r o f R o t a t i o n & A n g l e o f R o t a t i o n S q u a r e & I n t e r s e c t i n g p o i n t o f d i a g o n a l s & 4 & 90^{\circ} R e c t a n g l e & I n t e r s e c t i n g p o i n t o f d i a g o n a l s & 2 & 180^{\circ} R h o m b u s & I n t e r s e c t i n g p o i n t o f d i a g o n a l s & 2 & 180^{\circ} E q u i l a t e r a l t r i a n g l e & I n t e r s e c t i n g p o i n t o f m e d i a n s & 3 & 120^{\circ} R e g u l a r h e x a g o n & I n t e r s e c t i n g p o i n t o f d i a g o n a l s & 6 & 60^{\circ} C i r c l e & C e n t r e & I n f i n i t e & A t e v e r y p o i n t S e m i - c i r c l e & M i d - p o i n t o f d i a m e t e r & 1 & 360^{\circ} \end{matrix}$

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Fill in the blanks:

Shape	Centre of Rotation	Order of Rotation	Angle of Rotation
Square	-	-	-
Rectangle	-	-	-
Rhombus	-	-	-
Equilateral Triangle	-	-	-
Regular Hexagon	-	-	-
Circle	-	-	-
Semi-circle	-	-	-

Q. How many center of rotation are in the square, rectangle,Rhombus circles and a semi circle

Question 2

Match the following
$\begin{matrix} M e a s u r e o f T r i a n g l e & T y p e s o f t r i a n g l e 3 s i d e s o f e q u a l l e n g t h & S c a l e n e 2 s i d e s o f e q u a l l e n g t h & I s o s c e l e s r i g h t a n g l e A l l s i d e s a r e o f d i f f e r e n t l e n g t h & O b t u s e a n g l e 3 a c u t e a n g l e s & R i g h t a n g l e 1 r i g h t a n g l e & E q u i l a t e r a l 1 o b t u s e a n g l e & A c u t e a n g l e 1 r i g h t a n g l e w i t h t w o s i d e s o f e q u a l L e n g t h & I s o s c e l e s \end{matrix}$

Shape	Centre of rotation	Order of rotation	angle of rotation
Equilateral Triangle	P
Rectangle		Q
Square	R		S

Find P, Q, R and S respectively.

Q. What is the variance of the following data ?

\begin{matrix} Value & Frequency 4 & 1 2 & 2 0 & 2 - 2 & 2 - 4 & 1 \end{matrix}

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Rotational Symmetry

Standard VII Mathematics

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Question 4 Fill in the blanks: ShapeCentre of RotationOrder of RotationAngle of RotationSquareRectangleRhombusEquilateral triangleRegular hexagonCircleSemi−circle