Estimate Perimeter in dotted lines

Transcript

Estimate Perimeter in dotted linesAkshi says that the perimeter of this triangle shape is 9 units. Toshi says it can’t be 9 units and the perimeter will be more than 9 units. What do you think? We have two types of lines here Straight Lines (s): These are the lines that go straight up, down, left, or right. We assume that length of straight line is 1 unit Diagonal Lines (d): These are the slanted lines that cut across the squares. They are longer than straight lines. So, more than 1 unit Now, let's look at the triangle: Akshi thinks the perimeter is 9 units because she counted 9 segments in total (6 red and 3 blue). Toshi is correct because she understands that the 3 blue diagonal lines are longer than the 6 red straight lines. The actual perimeter is 6 straight units + 3 diagonal units Or 6s + 3d Which is definitely more than 9 units. Thus, Toshi is correct