Rectangle Area: 21×9

easyGrade 4-6rectangle area

The Problem

A rectangle has a length of 21 meters and a width of 9 meters. What is the area of the rectangle?

Answer:

189 square meters

Key Information

  • Length: 21 meters
  • Width: 9 meters

Formula

Area = Length × Width

Step-by-Step Solution

1

Identify dimensions

Length = 21 m, Width = 9 m
2

Recall area formula

Area = Length × Width
3

Substitute values

Area = 21 × 9
4

Calculate

21 × 9 = 189
5

Final answer

The area is 189 square meters

Common Mistakes to Avoid

  • Adding instead of multiplying
  • Confusing perimeter with area

Helpful Tips

  • Area is always length times width for rectangles
  • Answer should be in square units

Real-World Application

Rectangle area calculations are used in construction, gardening, and room planning.

Related Topics:

geometryarearectangleword problems

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