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The problem involves quadrilateral \( ABCD \), with the following details provided:

1. \( \overline{AB} = 20 \, \text{cm} \), \( \overline{CD} = 10 \, \text{cm} \).
2. \( m\angle A + m\angle B = 90^\circ \) (sum of angles \( A \) and \( B \)).
3. \( \overline{AD} = \overline{BC} \).

The goal is to determine the area of this quadrilateral.

### Step-by-step approach:

1. **Identify geometry**:
   - \( AB = 20 \, \text{cm} \), \( CD = 10 \, \text{cm} \), and \( AD = BC \).
   - The angles \( A \) and \( B \) are supplementary and add up to \( 90^\circ \), which suggests some symmetry.

2. **Area decomposition**:
   Since the quadrilateral doesn't seem to fall into a special category, it might help to divide it into two triangles, \( \triangle ABC \) and \( \triangle ACD \), and calculate their areas separately.

   Let me now calculate the area based on this information.The area of triangle \( ABC \) is \( 100 \, \text{cm}^2 \).

Since the quadrilateral is symmetric and we are given that \( \overline{AD} = \overline{BC} \), the area of the quadrilateral can be determined by summing the areas of the two triangles. Thus, the area of the entire quadrilateral is approximately:

\[
\text{Total Area} = 100 \, \text{cm}^2
\]

If you'd like more details or have any questions, feel free to ask! Here are some related questions to deepen your understanding:

1. How does the sum of angles in a quadrilateral relate to its shape?
2. What would happen if the angles \( A \) and \( B \) were not complementary?
3. How can we find the height of a triangle if only the base and angles are known?
4. What is the significance of symmetry in calculating areas of polygons?
5. Can we use the Pythagorean theorem in this situation?

**Tip**: In cases of quadrilaterals, breaking them into simpler shapes like triangles often helps simplify complex area calculations.

Soit le quadrilatère ABCD. Déterminer la valeur de son aire.

Learn how to calculate the area of quadrilateral ABCD, where m∠A + m∠B = 90° and AD = BC. Explore symmetry in geometry, applying the Pythagorean theorem and triangle area formulas. Suitable for Grades 9-11 geometry students.

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