Calculate Trapezoid Area: Finding Area of ABCD with Base Lengths 7 and 11

To calculate the area of the trapezoid ABCD, we will follow these steps:

Given:

• Base $AB = 7$
• Base $CD = 11$
• Height $= 5$

Apply the trapezoid area formula:

The formula for the area of a trapezoid is:

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

Substitute the values into the formula:

$A = \frac{1}{2} \times (7 + 11) \times 5$

Simplify the expression:

$A = \frac{1}{2} \times 18 \times 5$

Calculate:

$A = \frac{1}{2} \times 90$

Finally, compute the area:

$A = 45$

Thus, the area of trapezoid ABCD is $45$.