# If O is the origin and if A(x1,y1), B(x2,y2) are two points then OA.OB.sin

1.  x12+y12-x22-y22

2.  x1x2+y1y2

3.  x1y2+x2y1

4.  x1y2-x2y1|

4

x1y2-x2y1|

Explanation :
No Explanation available for this question

# If A=(1,1) ,B=(4,5) and C=(6,13) then cos A=

1.  64/63

2.  63/65

3.  56/36

4.  36/56

4

63/65

Explanation :
No Explanation available for this question

# If the vertices of a triangle A,B,C are A(0,0), B(2,1), C(9,-2) then cos B=

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# The points (2,5), (0,3), (2,1), (4,3) taken in order, form

1.  Parallelogram

2.  rectangle

3.  rhombus

4.  aquare

4

aquare

Explanation :
No Explanation available for this question

# The points (7,1), (4,4), (-2,-2), (1,-5) taken in order, form

1.  paralleogram

2.  rectangle

3.  rhombus

4.  square

4

rectangle

Explanation :
No Explanation available for this question

# The points (7,8), (1,6), (-1,0), (5,2 ) taken in order, form

1.  paralleogram

2.  rectangle

3.  rhombus

4.  square

4

rhombus

Explanation :
No Explanation available for this question

# The points (-5,12), (-2,-3), (9,-10), (6,5) taken in order, form

1.  paralleogram

2.  rectangle

3.  rhombus

4.  square

4

paralleogram

Explanation :
No Explanation available for this question

# If the distance of (4,0) from (a,b) is double the distance of the other point (a,b) from the x-axis, then the relation between a and b is

1.  (a-2)2= b2

2.  (a+2)2= b2

3.  (a-4)2= 3b2

4.  done

4

(a-4)2= 3b2

Explanation :
No Explanation available for this question

# .If A(3,-4),B(7,2) are the ends of a diameter of a circle and Cis a point on the circle then the circumcentre of ABC is

1.  (3,-4)

2.  (7,2)

3.  (5,-1)

4.  (0,0)

4

(5,-1)

Explanation :
No Explanation available for this question

1.  (-1,-1)

2.  (-1,1)

3.  (1,-1)

4.  (1,1)

4