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The ideas in this geometry lesson are taken from Math Mammoth Geometry 1 book. Area of rectangles
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| When we think of the area of something, we think how
much ground it is covering (or would cover).
For example, the football field covers a certain amount of ground. The stamp covers a tiny amount of ground if placed on ground. A sheet of paper covers more than a stamp but less than a football field. |
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Area is always measured in squares of some size. People often use square inches, square feet, square miles, square centimeters, and square meters for measuring area. We use the superscript “2” with a unit of length to indicate the “squaring”. For example, 8 in2 means 8 square inches, and 120 cm2 means 120 square centimeters. |
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The area of this square is 1 square inch or 1 in2. |
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1. Find the areas of these rectangles. No particular unit is given,
so we use “square units”.
a. ________ square units b. ________ square units c. ________ square units
d. ________ square units e. ________ square units
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The following pictures are not to scale. They illustrate some other units of area.
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You can find the area of a rectangle by multiplying the side lengths. |
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2. Draw a square with the area of...
| a. 4 square inches
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b. 9 square centimeters |
| c. 1 square foot (on a separate paper) | |
3. Find the areas of the rectangles when the sides are known. Remember to use
the right unit for area.
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a. A = ______________ |
b. A = ______________ |
c. [available in the book] |
4. Find the missing measurements.
a.
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b. [available in the book] |
c. [available in the book] |
5. Draw a figure.
a. A rectangle with
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b. A square with |
c. An L-shape with |
6. How many square units is in the area of these shaded shapes?
| a. | b. | c. | d. |
7. Draw three different rectangles that have the area of 30 square units.
| 8. The side of each little square is 3 cm. What is the area of the shaded rectangle? Don't get fooled! |
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9. Challenge. Find the areas of the shaded figures. Hint: In (c), divide the figure into two rectangles.
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a.
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b. [available in the book] |
c. [available in the book]
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The ideas in this geometry lesson are taken from Math Mammoth Geometry 1 book.
The fast, FUN, and easy way to learn multiplication. Learn the upper times tales in two sittings using mnemonic stories.
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Copyright 2003-2012 Maria Miller
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