1. 4.3 The Rectangle, Square and Rhombus The Rectangle
A parallelogram that has a right angle.
Corollary 4.3.1: All angles of a rectangle are right angles
Theorem 4.3.2: The diagonals of a rectangle are congruent. Proof p. 196
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Section 4.3 Nack

2. The Square and the Rhombus
A rectangle that has two congruent adjacent sides.
Corollary 4.3.3: All sides of a square are congruent
Rhombus
A parallelogram with two congruent adjacent sides.
Corollary 4.3.4: All sides of a rhombus are congruent.
Theorem 4.3.5: The diagonals of a rhombus are perpendicular.
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Section 4.3 Nack

3. Pythagorean Theorem
In a right triangle with hypotenuse of length c and legs of lengths a and b, if follows that c² = a² + b²
11/27/2018
Section 4.3 Nack