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Area of a Rectangle

Part of the Polygons & Quadrilaterals section of Coddy's Geometry journey. Lesson 37 of 61.

The area of a shape is how many unit squares cover it. A rectangle 7 long and 3 wide holds 3 rows of 7 unit squares, so its area is 7 × 3 = 21 square units.

$Rectangle ABCD with AB = 7 and BC = 3$

That is the rule Area of a rectangle: area = length × width, using two sides that meet at a corner. On the board, tap inside the rectangle (choose Area if the board asks) and pick the rule.

Challenge

ABCD is a rectangle with AB = 11 and BC = 4. Find its area: tap inside it, pick the rule, then press Check.

Try it yourself

$Find the marked part of the figure$

Find the marked part of the figure

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Polygons & Quadrilaterals

2Regular Polygons

Regular Polygons From an Angle to the Sides Inside a Regular Polygon Recap: Regular Polygons

5Rectangles, Rhombi, Squares

Rectangles The Diagonal of a Rectangle Rhombus Angles Squares Recap: Special Parallelograms

8Area of Parallelograms

Area of a RectangleA Side from the Area Slide the Top Area of a Parallelogram Recap: Parallelogram Area

11Polygon Chases

Parallel Sides in a Pentagon Marks, Not Looks Pentagon with x Regular Shapes Together Recap: Polygon Chases