Lesson 8.4 Area and perimeter of irregular shapes Pick up 2 different colored highlighters (or colored pencils) for your notes today.

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Presentation transcript:

Lesson 8.4 Area and perimeter of irregular shapes Pick up 2 different colored highlighters (or colored pencils) for your notes today

What is the perimeter of this irregular shape? To find the perimeter, you first need to make sure you have all of the information you need. We are missing 2 numbers, you subtract or add to find these numbers. 19yd 7yd 18yd 30yd 23 yd 37yd Highlight the vertical sides all of the same color to help you. Add all of the sides up Subtract 30 and 23 The missing side is 7 The perimeter is 134 yd Highlight the horizontal sides all of the same color to help you. Subtract 37 and 19 The missing side is 18

What is the area of this irregular shape? To find the area of an irregular shape you need to split it up into shapes you already know. I see 2 rectangles, so I’m going to split my shape into 2 rectangles. 19yd 7yd 18yd 133 30yd 23yd 851 To get the total area you just need to add those amounts together 37yd Find the area of each rectangle now To find the area of the top rectangle you multiply 7 and 19 and get…. 984 sq. yd To find the area of the bottom rectangle you multiply 23 and 37 and get….

What is the perimeter of this irregular shape? 20in 3in 13in 7in 13in 19in 9in 20in Highlight the sides of your shape. Find the missing numbers for your shape Now that you have all of sides figured out you just need to add to find the perimeter The perimeter is….. 104 in

What is the area of this irregular shape? 20 in 3 in 39 13 in 7 in 133 19 in 9 in 117 7 20 in Remember, you need to split it up into shapes you know formulas for. I see 3 rectangles in this shape Draw in your imaginary lines to see the rectangles The area is….. Find the area of each rectangle 289 sq. in Multiply 13 and 3 to get….. Multiply 13 and 9 to get ….. Multiply 19 and 7 to get ….. Add all of the areas together

How do you find the area of the shaded region? Find the area of the big rectangle by multiplying 22 and 20 together 440 Find the area of the small rectangle by multiplying 12 and 10 together 120 Subtract the 2 totals to get the area of the shaded region 320 sq. ft