Page 165 - NUMINO Challenge_C1
P. 165
Answer
Key
Measurement Problem solving
13 Unit Area p.112~p.113 1 Divide the big hexagon into 24 small triangles.
Example 4 4, 25 The area of the big hexagon is 24, so the area of
each small triangle is 1. The colored region has
Try It Again A E D 9 small triangles, so the area is 1 9 9.
FH 2 The area of the small square is 25. Therefore,
B GC the area of the colored region is 25 as well.
Rotate square EFGH. The area of square
EFGH is 1 of the area of square ABCD.
2
160
Example 3, 3, 1, 3, 2, 2, 4
2, 3, 2, 3, 6
4, 6
Type 13-1 A Square inside a Right Isosceles Triangle p.114~p.115 Type 13-2 Triangles with the Same Area p.116~p.117
1
1 The area of the two small triangles is 27. Since
triangle A is made of four small triangles, the 2
area is 27 2 54.
2 The area of the colored square is 4 of the area
9
of triangle B. 54 9 4 24.
3
B
NUMINO Challenge C1
Key
Measurement Problem solving
13 Unit Area p.112~p.113 1 Divide the big hexagon into 24 small triangles.
Example 4 4, 25 The area of the big hexagon is 24, so the area of
each small triangle is 1. The colored region has
Try It Again A E D 9 small triangles, so the area is 1 9 9.
FH 2 The area of the small square is 25. Therefore,
B GC the area of the colored region is 25 as well.
Rotate square EFGH. The area of square
EFGH is 1 of the area of square ABCD.
2
160
Example 3, 3, 1, 3, 2, 2, 4
2, 3, 2, 3, 6
4, 6
Type 13-1 A Square inside a Right Isosceles Triangle p.114~p.115 Type 13-2 Triangles with the Same Area p.116~p.117
1
1 The area of the two small triangles is 27. Since
triangle A is made of four small triangles, the 2
area is 27 2 54.
2 The area of the colored square is 4 of the area
9
of triangle B. 54 9 4 24.
3
B
NUMINO Challenge C1
