STILLWATER CROSSING · THE COURSE NOTES · BRIDGE MATH 5/6

Week 26 · Circle Graphs

This week

Lessons 121, 122, 123, 124, & 125

Papers

Quiz 12 in class · Last test graded and signed at home · Vocab Walk opens

Method

No calculators, ever · show every step

Instructional notes

Circle Graphs: Use sectors to show data

To find the angle measure of any sector:

• Multiply the % by 3.6°

* A full circle graph is 100% and 360° so 360 ÷ 100 = 3.6*

Example

AQUARIUM ANIMALS 1) What animal is represented the least? Penguins 20% Eels Whales 2) Find the degree 40% measure for the Whales Sharks sector. 35% Eels 5% 40 × 3.6 = 144°

*Use student work-text page 217 for practice.

Instructional notes

Perimeter • distance around a 2-dimensional shape • add the length of all sides

Perimeter of a rectangle = length + length + width + width. • P = (2 × l) + (2 × w) Perimeter of a Square = side + side + side + side • P = 4s

Example

Find the perimeter of each. P = 2l + 2w P = 2(8) + 2(3) 3 feet P = 16 + 6 P = 22 feet 8 feet

P = 4s

P = 24 yards P = 30 cm 6 yards

Practice

Find the perimeter. 3 feet 12 inches

45 feet

P = 96 feet P = 48 inches

Instructional notes

Introduction to Area

Area: • measure of the space inside a 2D shape • found by counting the squares or using a formula • measured in square units

Area Formulas: Area : length x width or A=lw Area : side x side or A = s

Example

Find the area.

A = 7 sq. units A = lw A=s = (5)(3) =4 = 15 cm = 16 sq. ft

Practice

Find the area.

2 km

A = 7 sq. units A = 35 ff 2 A = 4 sq. km

✍ In your own words

write a word problem in which you must find the area. Be sure to solve the problem as well.

Homework this week

Work-text	Lesson 121	Lesson 122	Lesson 123	Lesson 124	Lesson 125
Speed drill	121	122	123	125

Terms on the record

Term	Meaning
circle graphs	Circle Graphs: Use sectors to show data

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