Question

AD = 12cm
AB = 20cm
Find the perimeter of BCD?​

Answer 1

Answer:

What is ABCD? Rectangle or Parallelogram?

I think the question is incomplete because it can be only solved if ABCD is rectangle.

Sol:

If ABCD is a rectangle.

BC=AD=12cm

DC=AB=20cm

Angle DAB=90° (Angle of a rectangle is 90°)

Now in Triangle DAB

By pythagoras theorem,

AD²+AB²=DB²

12²+20²=DB²

DB=√(144+400)

DB=4√34cm

Perimeter of Triangle BCD

BC+DB+DC

=12+20+4√34

=32+4√34

ANSWER