Perimeter of a polygon
Find the perimeter of triangle ABC and of rectangle DMPK as the sum of the lengths of all sides.
- Ukraine: grade 2
- Russia: grade 3
Guide
In Ukrainian Grade 2 the sum of the lengths of all the sides of a polygon is the perimeter of the polygon. The perimeter of triangle ABC is written P△ = AB + BC + CA.
The side lengths are written beside the sides (the drawing is not to scale). Add the lengths of all the sides and write the unit, centimetres (cm). The perimeter of rectangle DMPK is 2 + 5 + 2 + 5 = 14 (cm).