Exploring Area and Perimeter of Irregular Shapes

What is the first step in finding the area of an irregular shape?

• Finding the missing lengths

• Dividing the shape into rectangles

• Adding all the lengths together

• Multiplying the length by the width

How do you calculate the perimeter of an irregular shape?

• By adding the lengths of all sides together

• By dividing the shape into rectangles first

• By multiplying the lengths of all sides

• By subtracting the shorter lengths from the longer ones

What is the area of a rectangle with lengths 7cm and 3cm?

• 21cm squared

• 14cm squared

• 24cm squared

• 10cm squared

Tags

TEKS.MATH.4.5D

What is necessary to calculate the area of an irregular shape?

• Splitting the shape into rectangles

• Splitting the shape into triangles

• Knowing the formula for the area of a circle

• Having a ruler

Tags

TEKS.MATH.G.11B

How do you find a missing length when calculating the perimeter of an irregular shape?

• Using the lengths of parallel sides

• Splitting the shape into squares

• By guessing

• By using a protractor

When calculating the area of an irregular shape, what measurement units are used?

• Meters

• Square centimeters

• Centimeters

• Cubic centimeters

Tags

TEKS.MATH.5.4H

What is the perimeter of a shape with sides measuring 6cm, 4cm, 9cm, and 3cm?

• 24cm

• 38cm

• 18cm

• 22cm

Why is it important to know how to find missing lengths when calculating the perimeter?

• To practice subtraction skills

• To ensure accuracy in the perimeter calculation

• It's not important

• To make the shape look nicer

How do you approach finding the area of an irregular shape that needs to be split into three rectangles?

• Add the areas of all three rectangles

• Subtract the smallest rectangle from the total area

• Multiply the longest side by three

• Choose the largest rectangle and double its area

Tags

TEKS.MATH.3.6D

What is the final step in calculating the area of an irregular shape?

• Dividing the total by two

• Adding the areas of the divided shapes

• Measuring the longest side

• Drawing the shape on grid paper