Question

In quadrilateral PQRS, P(1, 3), Q(2, 6), R(5, 5) and S(6, 2)
are the four vertices. Prove that PQRS is a l/gm by vector
method.​

Answer 1

Answer:

yfjh.........................m.dgiit

Answer 2

PQRS. PQS 1/2[X1(Y2-Y3) +X2(Y3-Y1) +X3(Y1-Y2) ]

1/2[1(6-2) +2(2-3) +6(3-6) ]

1/2[4+2(-1) +6(-3) ]

1/2[4-2-18]

1/2[4-20]

1/2×(-16)

-16/2

-8

PRS 1/2[1(5-2) +5(2-3) +6(3-5) ]

1/2[3+5(-1) +6(-2) ]

: 1/2[3-5-12]

1/2[3-17]

1/2[-14]

-14/2

-7

NOW PQS+PRS

-8+(-7)

-8-7

-15