Regular & Irregular Shapes
With your kind teacher Mrs. Brenda β€οΈ
Today weβre learning about Perimeter β the total distance around the outside of a shape! Whether the shape is regular (all sides equal) or irregular (sides different), we just add up all the sides. Perimeter helps us build fences, measure rooms, and solve real-life problems.
Perimeter = Sum of ALL the sides
Square
Perimeter = 4 Γ side
Rectangle
Perimeter = 2 Γ (length + width)
Equilateral Triangle
Perimeter = 3 Γ side
Question 1 (Regular)
A square garden has sides of 12 metres. What is the perimeter?
Question 2 (Regular)
A rectangle is 15 cm long and 9 cm wide. What is its perimeter?
Question 3 (Irregular)
Find the perimeter of a shape with sides: 6 m, 8 m, 4 m, 5 m, 9 m
β’ Building a fence around your backyard
β’ Measuring the border of a hockey rink
β’ Framing a picture or a window
β’ Planning a garden or running track
β’ Wrapping a present with ribbon
Fantastic job! You can now find the perimeter of both regular and irregular shapes.
Try measuring the perimeter of your bedroom or a piece of paper at home!
Love and proud high-fives,
Mrs. Brenda β€οΈ