BBC

Area of squares, rectangles and compound shapes

The total area of a compound shape is found by adding up the areas of the rectangles that have created the whole shape. This may be done in more than one way. The calculation may use a subtraction of ...
Astronomy

In many articles in your magazine, you refer to regions of the sky as being measured in “square degrees.” How exactly is a square degree defined, and how many of them does ...

Those studying the sky calculate square degrees the same way someone on Earth figures out the area of a rectangle or a circle. If a sky object measures 1° by 2°, it’s like a box measuring 1 foot by 2 ...
Simon Fraser University

First Set of Practice Exercises on

For each of the following, say whether it is true or false. For the answers, click on "Answers" at the bottom of this page (after question #22). x's being a square is a sufficient condition for x's ...