Honors Geometry 10 Jan 2012WARM UP- THINK- 2 minutes silently PAIR- chat with a partner

1. Which of the equations is false? a) 52 = 10 b) 42 = 24 c) 62 = 36 d) 82 = 42

Explain how you found your answer

3. Solve for x and check

Check your homework √ if correct, x if incorrect

3 1

2 5 4

x x

ObjectiveStudents will apply area formulas for

parallelograms, triangles, trapezoids and kites to solve problems.

Students will use think-pair-share and present to their work to the class.

Homework DUE Today

pg. 430: 1- 15 odds, 19, 20, 22, 28

due Wed/ Thpg. 472: 17, 20, 21, 22

re-quiz on definitions of quadrilateralsalso KNOW area formulas for rectangles, parallelograms, triangles, trapezoids, kites

syllabus

Highlight as we read through the syllabus

Make sure you understand how you will be graded in this class

quiz- pass backyou must know the definitions/ sketches!

STUDY them!

Term Definition Example

Triangle area conjecture

The area of a triangle is given by the formula,

A is the area, b is the base, and h is the height of the triangle

Trapezoid Area

Conjecture

The area of a Trapezoid is given by the formula,

A is the area, b1 and b

2 are the bases

and h is the height of the trapezoid

Kite Area Conjecture

The area of a Kite is given by the formula,

A is the area, d1 and d

2 are the

lengths of the diagonals

1

2A b h

6in

4in

1 2

1

2A h b b

12cm

26cm

14cm

1 2

1

2A d d 44

6

10

a

Practice

1. Give the formula for the area of each figure:

2. Determine the height of the trapezoid if the area = 120 ft2

3. Determine the perimeter

4. Determine the height of the triangle if the area = 24 m2

7in

11in

12 ft

6 ft

6in

2126Area yd

b

6m5m

9m

4 ft

hft14yd

?m

5. What is the area of the shaded region

5in

4in

8

ALWAYS USE FORMAT:1. Formula 2. Substitute 3. Do the math 4. Units

debriefwhat is the format required for all area problems?

how do you find a base length of a trapezoid when given the area, the length of the other base and the height?

what do you need to practice/ study for tomorrow’s quiz?