If the length of is 4 units, the area of ∆ADC is square units.

Answer: the area of ∆ADC is 6

Step-by-step explanation:Solution - As the triangle ADC is the reflection of the triangle ABC, so the area of both the triangles will be same.

Here BE is the height and AC is the base of ABC.

Area of triangle ABC = * Base*Height

= * 3*4

= 6 sq. units

So the area of triangle ADC = 6 sq. units