Question

PQ : QR = 3:4
QR : RS
Find PQ : QR : RS ?​

Answer 1

The number of triangles with vertices on side, AB,BC,CD=3C

1

×4C

1

×5C

1

∴ Total no. of triangles =3C

1

×4C

1

×5C

1

+3C

1

×4C

1

×6C

1

+3C

1

×5C

1

×6C

1

+4C

1

×5C

1

×6C

1

=3×4×5+3×4×6+3×5×6+4×5×6

=342