Rectangles Worksheet - Properties & Practice for 3rd Grade

Complete rectangles worksheet covering properties, area, perimeter, and identification for 3rd grade math.

Rectangles Worksheet Exercises
Worksheet Section 1: Rectangle Properties
Identify and measure rectangles
1 Rectangle identification
Exercise 1
Which shape is a rectangle?
A) ⬛ Square B) 🟨 Rectangle C) 🔺 Triangle D) 🔵 Circle
Definition:

Rectangle: A four-sided shape with 4 right angles and opposite sides equal

Rectangle identification method:
  1. Count 4 sides
  2. Check for 4 right angles (□)
  3. Verify opposite sides are equal
  4. Confirm it's not a square (unless specified)
Shape A
⬜ Square
Shape B
🟨 Rectangle
Correct
🟨 B
Step 1: Analyze each option

Square: Has 4 equal sides and 4 right angles

Rectangle: Has 4 right angles but length ≠ width

Triangle: Only 3 sides

Circle: No sides

Step 2: Apply rectangle definition

Rectangle needs 4 sides, 4 right angles, and opposite sides equal

Step 3: Select the correct answer

Only 🟨 Rectangle meets all requirements

Answer: B) 🟨 Rectangle
Final answer:

Rectangle has 4 right angles and opposite sides equal

Applied rules:

• Rectangle properties: 4 sides, 4 right angles, opposite sides equal

• Shape identification: Match characteristics to definition

• Visual analysis: Count sides and check angles

2 Perimeter calculation
Exercise 2
Find the perimeter of a rectangle with length 8 cm and width 5 cm
Definition:

Perimeter: Total distance around a shape

Length
8 cm
Width
5 cm
Formula
P = 2(l+w)
Step 1: Identify dimensions

Length (l) = 8 cm, Width (w) = 5 cm

Step 2: Apply perimeter formula

Perimeter = 2 × (length + width)

P = 2 × (8 + 5)

Step 3: Calculate the perimeter

P = 2 × 13 = 26 cm

Perimeter = 26 cm
Final answer:

Perimeter = 26 cm

Applied rules:

• Perimeter formula: P = 2(l + w) for rectangles

• Addition: Calculate inside parentheses first

• Multiplication: Multiply by 2 for total perimeter

3 Area calculation
Exercise 3
Find the area of a rectangle with length 7 cm and width 4 cm
Definition:

Area: Space inside a shape measured in square units

Length
7 cm
Width
4 cm
Formula
A = l × w
Step 1: Identify dimensions

Length (l) = 7 cm, Width (w) = 4 cm

Step 2: Apply area formula

Area = length × width

A = 7 × 4

Step 3: Calculate the area

A = 28 square cm

Area = 28 square cm
Final answer:

Area = 28 square cm

Applied rules:

• Area formula: A = l × w for rectangles

• Multiplication: Multiply length by width

• Units: Area measured in square units

Worksheet Activities & Practice
Worksheet Section 2: Drawing & Measuring
Hands-on activities
Length = 6 cm
Width = 4 cm
Area = Length × Width
Rectangle Area Formula
Perimeter = 2(Length + Width)
Rectangle Perimeter Formula
📏
Measure Activity
Draw rectangles with specific dimensions
📐
Calculate Area
Find area of given rectangles
📐
Calculate Perimeter
Find perimeter of given rectangles
🔍
Identify Rectangles
Spot rectangles in complex figures
4 Right Angles: All corners measure 90°
Opposite Sides Equal: Parallel sides have same length
Parallel Sides: Opposite sides run parallel
Quadrilateral: Has 4 sides and 4 vertices
Worksheet Summary & Q&A
Worksheet Section 3: Review & Practice
Key concepts review
Detailed Summary: Rectangles Worksheet
Definition: A rectangle is a four-sided shape (quadrilateral) with four right angles (90°) and opposite sides that are equal in length. The longer side is called the length, and the shorter side is called the width.
Properties: - 4 sides and 4 vertices (corners) - 4 right angles (each 90°) - Opposite sides are parallel and equal - Adjacent sides meet at right angles
Area Formula: Area = length × width. This tells us how much space is inside the rectangle, measured in square units (cm², m², etc.).
Perimeter Formula: Perimeter = 2 × (length + width). This tells us the total distance around the rectangle, measured in linear units (cm, m, etc.).
Method Steps: 1. Identify the rectangle and its dimensions 2. Label length and width 3. Apply the correct formula (area or perimeter) 4. Calculate and include units
Examples: - Rectangle 5cm × 3cm: Area = 15cm², Perimeter = 16cm - Rectangle 8m × 2m: Area = 16m², Perimeter = 20m
Tips: - Always measure both length and width - Remember to multiply for area, add for perimeter - Include units in your final answer
Memorization Aid: "Length times width gives area, add all sides for perimeter."
Tip 1: Remember: Area covers inside, Perimeter goes around
Tip 2: Draw a picture to visualize the rectangle
Tip 3: Always write down the formula before solving
Tip 4: Check that opposite sides are equal in rectangles

Worksheet Q&A

Question: How can I remember the difference between area and perimeter?

Answer: Here are some helpful memory tricks:

  • Perimeter: Think "Peri-meter" = measuring "around" the edge (like walking around the fence of a yard)
  • Area: Think "A-R-E-A" = "Are you inside?" (the space inside the shape)

Another way to remember:

  • Perimeter: Add up all the sides (around the outside)
  • Area: Multiply length × width (space inside)

Perimeter = fence around a yard, Area = carpet covering the floor!

Question: Do squares count as rectangles too?

Answer: Yes, squares are a special type of rectangle! Here's why:

  • A rectangle must have 4 right angles and opposite sides equal
  • A square has 4 right angles and all 4 sides equal
  • Since all sides are equal, opposite sides are definitely equal
  • So a square meets all the requirements of a rectangle

Think of it this way: All squares are rectangles, but not all rectangles are squares. It's like how all cats are animals, but not all animals are cats.

Question: What if I forget the formulas during a test?

Answer: Here are strategies to remember formulas:

  • For Area: Think "How much carpet do I need?" - Length × Width
  • For Perimeter: Think "How much fence do I need?" - Add all sides
  • Draw a rectangle and label the sides - this visual helps recall formulas
  • Remember: Area = covering (multiply), Perimeter = border (add)

If you're still stuck, draw the rectangle on scratch paper and count the units. This takes longer but helps you get the right answer!