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Answer:

Step-by-step explanation:
Given



Required
Determine CD
Since, C is a point on BD, the relationship between the given parameters is;

Substitute the values of BD, BC and CD

Collect Like Terms


Divide both sides by -4


To determine the length of CD;
Substitute 3 for x in 
Hence;

9 is 22.5% of 40 if that's the question.
Answer:
The entire trapezoid is 48 units sq
the cut out part is 30
the trapezoid without the cutout is 18
Step-by-step explanation: