Find the Perimeter
What is the perimeter of a rectangle with a length of 8cm and a width of 3cm?
What is 22cm
What is the area of a rectangle with a length of 8cm and a width of 3cm?
What is 24 cm2.
Ms. Gero made a sign for her lemonade stand. It was 22 inches high and 18 inches wide. What is the
perimeter and area of the sign? Show all of your work.
P = 22 inch + 18 inch + 22inch + 18inch = 80inch
A = 22 x 18 = 396 inch2
If you wanted to build a fence to go around your house would you need to find the perimeter or area?
You would need to find the perimeter.
Draw 2 rectangles with a perimeter of 12cm, but different areas.
5 cm, 1cm, 5cm, 1cm, A= 10cm2
4cm, 2cm, 4cm, 2cm, A = 8cm2
3 cm, 3cm, 3cm, 3cm, A= 9cm2
What is the perimeter of a square with a side measuring 8 inches?
What is 32 inches
What is the area of a figure with a length of 9 cm and a width of 12 cm?
What is 108 cm2
Ms. Desmond is putting a fence up around her house. Her yard is 15 meters by 8 meters. What is the perimeter and area of her yard? Show all of your work.
P = 15m + 8m + 15m + 8m = 46cm
15m x 8m = 120m2
If you needed to know how many tiles it would take to cover the floor would you find the perimeter or area?
You would find the area.
Draw 2 rectangles with a perimeter of 16cm, with different areas.
5cm, 3cm, 5cm, 3cm A= 15cm2
4cm, 4cm, 4cm, 4cm, A = 16cm2
6cm, 2cm, 6cm, 2cm, A = 12cm2
1cm, 7cm, 1cm, 7cm, A = 7cm2
A rectangle has a perimeter of 14 inches. The length of one side is 4 inches. What is the width of one side?
What is 3 inches.
What is the area of a square room with a side of 25 ft?
625 ft2
Sarah's notepad on her desk is 21cm by 12cm. What is the perimeter and area of the notepad? Show all of your work.
P = 21cm + 12cm + 21cm + 12cm = 66cm
A = 21cm x 12cm = 252cm2
If you needed to buy fertilizer to spread on your 20 cm by 15 cm rectangular garden, would you need to find the perimeter or area?
You would need to find the area.
Draw 2 rectangles with and area of 12cm2 but with different perimeters.
1 x 12 ( P = 12cm + 1cm +12cm +1cm = 26cm)
2 x 6 ( P = 6cm + 2cm + 6cm + 2cm = 16cm)
What is the perimeter of a square with a side length of 9in?
What is 36 inches.
What is the length of a rectangle with the area of
15 cm2 feet and the width of 5 ft?
What is 3ft.
Peter, Molly, and Ryan each have a bedroom in their house.
Peter’s bedroom is 8 ft. by 8 ft.
Molly’s bedroom is 7 ft. by 9 ft.
Ryan’s bedroom is 6 ft. by 10 ft.
Whose bedroom has the largest perimeter? Draw and explain your answer.
Peters room = 8ft + 8ft +8ft +8ft = 32ft
Molly's room = 7ft + 9ft +7ft +9ft = 32 ft
Ryan's room = 6ft + 10ft + 6ft + 10ft = 32 ft
They're all the same!
Alicia needs to mix up enough blue icing to make a trim of flowers to decorate the edges of the cake? Would she need to find the perimeter or area?
She needs to find PERIMETER.
Draw 2 different rectangles with an Area of 72cm2 with different perimeters.
1 x 72 (P = 72cm + 1cm + 72 cm +1cm = 146cm)
2 x 36 (P = 36cm + 2cm + 36cm + 2cm = 76cm)
3 x 24 (P = 24cm + 3cm + 24cm +3cm = 54 cm)
4 x 18 (P= 18cm + 4cm +18cm +4 cm = 44cm)
6 x 12 (P = 12cm + 6cm +12cm +6cm = 36cm)
8 x 9 (P = 9cm + 8cm + 9cm + 8cm = 34 cm)
How do you find perimeter?
What is L + W + L +W
A square has the area of 144 inch2. What is the length of the square?
What is 12 inches.
Peter, Molly, and Ryan each have a bedroom in their house.
Peter’s bedroom is 8 ft. by 8 ft.
Molly’s bedroom is 7 ft. by 9 ft.
Ryan’s bedroom is 6 ft. by 10 ft.
Whose bedroom has the largest area? Draw and explain your answer.
Peter's room = 8ft x 8ft = 64 ft2
Molly's room = 7ft x 9ft = 63ft2
Ryan's room = 60ft2
Answer = Peter's room has the greatest area!
Hannah wants to make a tablecloth for her new kitchen table.
She needs to find the AREA
Draw 2 rectangles with an area of 100cm2 but with different perimeters.
100 x 1 (P = 100cm + 1cm +100cm +1cm = 202cm)
50 x 2 (P= 50cm + 2cm + 50cm + 2cm = 104 cm)
25 x 4 (P = 25cm +4cm + 25cm +4cm = 58cm)
10 x 20 (P = 10cm + 20cm +10cm +20cm = 60cm)