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Area and Perimeter

Mathematics, Grade 4

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Study Guide Area and Perimeter Mathematics, Grade 4

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AREA AND PERIMETER AREA The area of a figure is the space INSIDE the figure. Area is usually written in terms of square centimeters, inches, feet, etc. Finding the area of a rectangle: Area of a rectangle = the length X width of the rectangle The length (longer side) of this rectangle = 5 cm The width (shorter side) of this rectangle = 2 cm So the area of this rectangle = 5 X 2 5 X 2 = 10 square cm The area of this rectangle = 10 cm © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
Finding the area of a square is very similar. Area of a square = side length X side length All sides of this square = 3 cm. So the area of this rectangle = 3 X 3 3 X 3 = 9 The area of this rectangle = 9 square cm © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
You Try: What is the area of this rectangle? a] 28 cm b] 14 cm c] 36 cm d] 11 cm Answer: 28 cm (because 7 X 4 = 28) PERIMETER The perimeter of a polygon is the distance AROUND it. The perimeter is the sum of the lengths of ALL the sides. To find the perimeter of a polygon, you ADD the lengths of each side together. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
Let’s Practice: Step 1: First, you need to find out the lengths of the other two sides. We know that in a rectangle the OPPOSITE sides are the SAME length. Step 2: Let’s add the length of the longer sides first (length): 8 + 8 = 16 Step 3: Add the length of the shorter sides next (width): 3 + 3 = 6 Step 4: Now add both totals together: 16 + 6 = 22 Answer: The perimeter of the rectangle = 22 cm © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
You Try: What is the perimeter of this triangle? a] 4 cm b] 8 cm c] 12 cm d] 16 cm Answer: c] 12 cm (because 4 + 4 + 4 = 12) © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
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