Page 165 - NUMINO Challenge_B1
P. 165
Answer p.108~p.109 3
Key
136
Creative Thinking
Draw 2, 3, 4, and 5 lines to create the maximum
1 number of intersecting points in order to find the
rule. The maximum number of intersecting points
5 times is 1, 3, 6, and 10 respectively. These values can be
expressed as 1, 1 2, 1 2 3, and 1 2 3 4.
2 So, the maximum number of intersecting points
that can be formed by n lines is 1 2 3
n 1. Therefore, the maximum number of
intersecting points that will be formed by 7 lines is
1 2 3 4 5 6 21.
4
19
NUMINO Challenge B1
Key
136
Creative Thinking
Draw 2, 3, 4, and 5 lines to create the maximum
1 number of intersecting points in order to find the
rule. The maximum number of intersecting points
5 times is 1, 3, 6, and 10 respectively. These values can be
expressed as 1, 1 2, 1 2 3, and 1 2 3 4.
2 So, the maximum number of intersecting points
that can be formed by n lines is 1 2 3
n 1. Therefore, the maximum number of
intersecting points that will be formed by 7 lines is
1 2 3 4 5 6 21.
4
19
NUMINO Challenge B1
