Class 8 , math ,AMV 2080

• A= {1,2,3,4} , B = {2,3,4,5 } ,then A U B ={1,2,3,4}U{2,3,4,5 }={1,2,3,4,5}

• A= {1,2,3,4} , B = {2,3,4,5 } ,then A -B ={1,2,3,4} - {2,3,4,5 }={1}

• B = {2,3,4,5 },A= {1,2,3,4},then B-A ={2,3,4,5 } - {1,2,3,4}={5}

• A= {1,2,3,4} , B = {2,3,4,5 } ,then A U B ={1,2,3,4} U{2,3,4,5 }={2,3,4}

in above figure,

Are line AB and CD parallel ?

Are XY and MN parallel ?

Which of below answer is wrong ?

• line AB and CD are parallel because Alternate angle are equal.

• yes, Lines XY and MN are Parallel because sum of co-interior angles equal to 180.

• No, Lines XY and MN are not Parallel because sum of co -interior angles not equal to 180.

From above figures
Are line PQ and RS parallel lines?
Are AB and CD parallel lines ?
Give reasons.

which is incorrect answer ?

•  $\angle UWQ=140^o,\ \angle WXS=100^o$  
  
  PQ is not parallel to RS. Because ,  $\angle UWQ\ne\angle WXS\ \left[Corresponding\ angles\ are\ not\ equal\right]$  
  

•  $PQ\ \parallel\ RS$   because ,Corresponding angles are equal .

•  $\angle BGH\ =\angle\ DHF\ =120^o$  
  AB is Parallel to CD because corresponding angles are equal.[ or ,  $AB\parallel CD$  

which are correct ?answer based on Venn Diagram.

• Set A and L are overlapping sets.

• n(A)=4

which are correct options? based on circle.find diameter, circumference and area of circle.

which are correct options? based on circle.find diameter, circumference and area of circle.

• 6

• 8

• 10

• 4

 $\frac{x^a}{x^a}\ ×\ \frac{x^b}{x^b}$  

• 1

• 0

•  $x^{a+b}$  

•  $x^{a-b}$  

From above Venn Diagram find AUB , A-B , B-A  and  $A\cap B$  

Find Which  answer is wrong?

• A= {1,2,3,4} , B = {2,3,4,5 } ,then A U B ={1,2,3,4}U{2,3,4,5 }={1,2,3,4,5}

• A= {1,2,3,4} , B = {2,3,4,5 } ,then A -B ={1,2,3,4} - {2,3,4,5 }={1}

• B = {2,3,4,5 },A= {1,2,3,4},then B-A ={2,3,4,5 } - {1,2,3,4}={5}

• A= {1,2,3,4} , B = {2,3,4,5 } ,then A U B ={1,2,3,4} U{2,3,4,5 }={2,3,4}

•  $A\cap B=\left\{1,2,3,4\right\}\cap\left\{2,3,4,5\right\}=\left\{2,3,4\right\}$  

Simplify using law of indices

 $\frac{x^5}{x^3}$  

•  $x^5$  

•  $x^3$  

•  $x^2$  

•  $x^4$