Chapter 9
Math 7
Class Notes
Areas of Rectangles and Squares
Formulas
1. Area of a Rectangle: A = lw
2. Area of a Square: A = s
** IMPORTANT **
When finding area – Units are always squared.
EXAMPLES
Make sure to show the formula used and each step to receive full credit.
Label, label, label
| 1.
| Find the area of rectangle ABCD |
| | |
A = lw
A = (9cm)(4.65 cm) [show multiplication work – no calculator]
A = 41.85 cm
OR 41.85 cm. sq. OR 41.85 sq. cm.
Find the area of square JKLM
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| A = s
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| A = (17.25 cm)
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| A = (17.25cm)(17.25 cm) |
[show multiplication work – no calculator]
A = 297.5625 cm
OR 297.5625 cm. sq. OR 297.5625 sq. cm.
Textbook pages 250-253
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