TERM 3 UNIT 4
Chapter 11 – Area
11.1 Area of Parallelograms p. 595
BR: Review 30-60-90/45-45-90 Triangles
Quad Basics (flip chart and guided notes)
Demo: Chop off corner of rectangle to form a parallelogram. Hence, same Area formula as a rectangle.
Ex 1
Remember 30-60-90 and 45-45-90 to help find height. Height MUST be perpendicular.
Practice p. 598 #3, 4, 5 (#3 beware that 5 is the total base, but you need 4.5√3 for the height)
Ex. 2
Look quickly – real life application
Practice #8, 15
Ex. 3
Use slope to determine parallel or perpendicular – is the figure a rectangle, parallelogram?
*You will need this to find a missing 4th vertex on the test
Practice #6, 7 (need graph paper)
CW #1 p. 598 #9-11, 15-17, 20-28e
11.2 Area of Triangles, Trapezoids, and Rhombi p. 602
Ex. 1
Triangles – Add 2 triangles together to form a weird quad; practice #5
Ex. 2
Trapezoid #6, 8 (graph)
Ex. 3
Rhombus #4, 9 (graph)
Ex. 4
What if given AREA and missing height or diagonal? Use Formula! #10, 11
CW #2 p. 606 #14-20even, 30-35 all
CW #3 Kuta Worksheet: solve for length, width, area, and perimeter
CW #4 Geri Wkst: Find missing vertex; use formulas to solve for missing info
GA #1
Optional Extra Review: p. 608/9 #59, 65-67 and QUIZ
11-3 Area of REGULAR Polygons and Circles
Areas of Regular Polygons = ½ Pa
Explain “regular”; P = Perimeter; a = Apothem – segment from center, perpendicular to side”
Ex 1
Demo “Imani’s process” step by step; practice #3, 4
Ex. 3
Irregular/Inscribed; practice #5, 6
Non-apothem problems, using 30-60-90 and 45-45- 90; p. 614 #5, 6, 14-18, #25
11-4 Area of Irregular figures
*Tip – Break up an irregular figures in different ways to find the best combination of shapes that are easiest to
work with.
Ex 1
Practice #3, 4, 7
Ex 3
Practice #5, 6
Practice
p. 619 #3-7
GA#2
Optional Extra Practice:
11-3 Study Guide & Practice Worksheets
p. 621 Quiz
CW #5 Matching Irregular shapes – Puzzle worksheet
CW #6 Green ACT p. 286-7, p. 289
QUIZ May not have time for the quiz??
TEST 4