Page 16 - NUMINO Challenge_A2
P. 16
Perimeter of Concave Polygons
If each matchstick is 1 cm long, find the perimeter of each figure by
counting the number of matchsticks that are added to the figure.
Number of Added Figure A
Matches 2
14
Perimeter (cm)
What do you observe from the answers?
In a Nutshell Perimeter of Concave Polygons
The perimeter of a concave polygon is equal to the sum of the
perimeter of the rectangle that contains its figure and the length
of the inverted portions.
Perimeter of a Concave Polygon
= (Perimeter of the Rectangle) (Sum of the Length of the Inverted Portions)
13Measurement
If each matchstick is 1 cm long, find the perimeter of each figure by
counting the number of matchsticks that are added to the figure.
Number of Added Figure A
Matches 2
14
Perimeter (cm)
What do you observe from the answers?
In a Nutshell Perimeter of Concave Polygons
The perimeter of a concave polygon is equal to the sum of the
perimeter of the rectangle that contains its figure and the length
of the inverted portions.
Perimeter of a Concave Polygon
= (Perimeter of the Rectangle) (Sum of the Length of the Inverted Portions)
13Measurement
