Abcd is a parallelogram and this figure is not drawn to scale.

 The length of AD is 80 cm.

Step-by-step explanation:  Given that ABCD is a parallelogram, where m∠BCD = 90°, AB = 39 cm and BD = 89 cm.

We are to find the value of AD.

We know that

the measures of the opposite angles of a parallelogram are equal.

So, in the parallelogram ABCD, we have

m∠BAD =  m∠BCD = 90°.

So, triangle ABD is a right-angled triangle  with AB and AD as two legs and BD as the hypotenuse.

Using Pythagoras law in triangle ABD, we get

Thus, the length of AD is 80 cm.

the function makes a strait line horizontally with no x intercept but a y intercept at 9.