Finding area by breaking up shape
Download as PPT, PDF3 likes876 views
The document provides instructions for finding the area of irregular shapes by breaking them down into regular shapes and calculating the individual areas. It demonstrates solving three example problems by identifying rectangles within irregular shapes, calculating the area of each rectangle, and adding the areas together to find the total area of the irregular shape.
Finding area by breaking up shape
- 1. Area of irregular shapes Pick up 2 different colored highlighters for your notes today
- 2. 19yd 30yd 37yd 23yd 7yd18yd 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. Find the area of each rectangle now To find the area of the top rectangle you multiply 7 and 19 and get…. To find the area of the bottom rectangle you multiply 23 and 37 and get…. 133 851 To get the total area you just need to add those amounts together 984 sq. yd
- 3. 19 in 7 in 3 in 13in 20 in 9 in 20 in 13 in What is the area of this irregular shape? 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 Find the area of each rectangle Multiply 13 and 3 to get….. Multiply 13 and 9 to get ….. 7 Multiply 19 and 7 to get ….. 39 117 133 289 sq. in The area is….. Add all of the areas together
- 4. 22 ft. 20 ft 12 ft 10 ft How do you find the area of the shaded region? Find the area of the big rectangle by multiplying 22 and 20 together Find the area of the small rectangle by multiplying 12 and 10 together Subtract the 2 totals to get the area of the shaded region 440 120 320 sq. ft