1. Base angles Isosceles trapezoids Midsegments
Trapezoids and kites
Base angles
Isosceles trapezoids
Midsegments

2. Trapezoid definition
A Trapezoid is a quadrilateral with only one pair of parallel sides.

3. Isosceles Trapezoids
Isosceles Trapezoids have congruent legs.

4. Theorem
In a Isosceles Trapezoid each pair of base angles are congruent.

5. Theorem
If a pair of base angles in a trapezoid are congruent, then the trapezoid is an isosceles trapezoid.

6. Theorem
In an Isosceles trapezoid the diagonals are congruent.

7. Definition of a Midsegment
Midsegment connect the midpoints of the legs.

8. Theorem
The Midsegment equal half the parallel sides sum.

9. Solve for NO =
The Midsegment equal half the parallel sides sum.

10. Definition of a Kite
A kite is a quadrilateral with two distinct pairs of adjacent sides that are congruent.

11. Theorem
Diagonals in a kite are perpendicular.

12. Theorem
In a Kite, exactly one pair of opposite angles are congruent.