In a `DeltaABC` if a = 7 , b = 8 and c = 9 , then the length of the line joining B to the mid-points of AC is

In a !ABC if a = 7 , b = 8 and c = 9 , then the length of the line joining B to the mid-points of AC is

In DeltaABC , a=7, b=5 and c=8, then find the value of cos2B.

In DeltaABC, a=9, b=8 and c=4, then 3cosB-6cosC=?

In DeltaABC , a=5, b=7, c=8, find cosB/2

In DeltaABC , if a = 2, b = 3, c = 4, prove that cosA=7/8 .

In a DeltaABC ,a =5 , b= 4 , and tan(C/2)=sqrt(7/9) , then c =

A B C D are four points in a plane and Q is the point of intersection of the lines joining the mid-points of A B and C D ; B C and A Ddot Show that vec P A+ vec P B+ vec P C+ vec P D=4 vec P Q , where P is any point.

A B C D are four points in a plane and Q is the point of intersection of the lines joining the mid-points of A B and C D ; B C and A Ddot Show that vec P A+ vec P B+ vec P C+ vec P D=4 vec P Q , where P is any point.

Sovle DeltaABC if a=3,b=5,c=7 .

In a A B C , find the measures of the angles of the triangle formed by joining the mid-points of the sides of this triangle.