Calculate Trapezoid Area: Finding Area of ABCD with Bases 5 and 10

To solve this problem, we'll calculate the area of trapezoid ABCD using the appropriate formula.

The formula for the area $A$ of a trapezoid is given by:

$A = \frac{1}{2} \times (\text{Base}_1 + \text{Base}_2) \times \text{Height}$

Substituting the given values into the formula, we have:

$A = \frac{1}{2} \times (5 + 10) \times 4$

First, calculate the sum of the bases:

$5 + 10 = 15$

Multiply by the height, and then take half:

$A = \frac{1}{2} \times 15 \times 4 = \frac{1}{2} \times 60 = 30$

Therefore, the area of the trapezoid ABCD is 30 square units.