In a quadrilateral ABCD, AB ∥ DC and AD ∥ BC . Find the perimeter of ΔCOD if point O is the intersection of the diagonals and AC = 20 in, BD = 20 in, AB = 13 in

33 inches

Step-by-step explanation:

In a quadrilateral ABCD, AB ∥ DC and AD ∥ BC.

AC = 20 in, BD = 20 in, AB = 13 in.

We want to find the perimeter of ΔCOD if point O is the intersection of the diagonals.

Since AB ∥ DC and AD ∥ BC, the point O divides the diagonals into two equal parts.

|OD|=|BD|/2 = 20/2 =10inch

Similarly,

|OC|=|AC|/2 = 20/2 =10inch

Also,

AB=CD=13 inch

Therefore,

Perimeter of ΔCOD= |OD|+|OC|+|CD|

=10+10+13

=33 inches

real numbers: b, d

Step-by-step explanation:

a, 11 is a odd number --> (-4i)? isn't a real number

b, 12 is a even number --> (-3i)? is a real number

c, (2+3i)? = (-5+12i)? --> isn't a real number

d, (4+5i)(4-5i) = 41 --> is a real number

e, = 100i --> isn't a real number