9-4 Proofs

Given: Parallelogram HIJK

Triangle HOI is conggruent to Triangle JOI

Prove: HIJK is a rhombus

Statement

1. Parallelogram HIJK, Triangle HOI is congruent to Triangle JOI.

2. Segment HI is congruent to segment JI.

3. HIJK is a Rhombus

Reason

1. Given

2. CPCTC

3. Definition of a Rhombus

9-5 Areas of Special Quadrilaterals

Area=Sides Squared

Area of a rectangle: A= Length times Width(of Base times Height).

Area of a parallelogram: A=Base times Height.

Area of a Rhombus: A=1/2 diagonal 1 times diagonal 2

Area of a trapezoid: A=1/2 (base1+base2)times height

Area of a Kite: A=1/2Diagonal 1 times diagonal 2

Problem 1-1

Wha is the area of a rectangle?

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