Page 155 - NUMINO Challenge_D1
P. 155
Answer
Key
Creative Thinking p.66~p.67 8 Solid Figures p.68~p.69
1 cannot be seen from a cube. Example 1 2 1, 2, 7
2
7
Top Front Side TryItAgain The base is a pentagon, so it is a pentagonal
pyramid. The number of faces is 5 1 6, the
3 The following 2 colored cubes must be added. number of vertices is 5 1 6, and the number of
edges is 5 2 10, so the sum is 6 6 10 22.
Example will not, 3
270 , 324 , will
240 , 300 , will
360 , cannot
4 If you look at the top view, ' ' marks where Type 8-1 Net of a Pyramid p.70~p.71
there is no red cube. If you look at the right 1 The base is a rectangle and the side faces are
view, ' ' marks where there are no red cubes. triangles, so it is a rectangular pyramid.
Therefore, the number of red cubes is 4. 2 7, 7
3 (44 7 4) 2 8 cm, so the sum of the length
and width of the rectangular base is 8 cm.
Therefore, the perimeter is 8 2 16 cm.
4 The area of a rectangle is greatest when the
length and width are the same, so the shape of
the base of the solid figure must be a square.
5 The length of the side of a square with a perimeter
of 16 cm is 4 cm, so the area is 4 4 16 cm2
NUMINO Challenge D1
Key
Creative Thinking p.66~p.67 8 Solid Figures p.68~p.69
1 cannot be seen from a cube. Example 1 2 1, 2, 7
2
7
Top Front Side TryItAgain The base is a pentagon, so it is a pentagonal
pyramid. The number of faces is 5 1 6, the
3 The following 2 colored cubes must be added. number of vertices is 5 1 6, and the number of
edges is 5 2 10, so the sum is 6 6 10 22.
Example will not, 3
270 , 324 , will
240 , 300 , will
360 , cannot
4 If you look at the top view, ' ' marks where Type 8-1 Net of a Pyramid p.70~p.71
there is no red cube. If you look at the right 1 The base is a rectangle and the side faces are
view, ' ' marks where there are no red cubes. triangles, so it is a rectangular pyramid.
Therefore, the number of red cubes is 4. 2 7, 7
3 (44 7 4) 2 8 cm, so the sum of the length
and width of the rectangular base is 8 cm.
Therefore, the perimeter is 8 2 16 cm.
4 The area of a rectangle is greatest when the
length and width are the same, so the shape of
the base of the solid figure must be a square.
5 The length of the side of a square with a perimeter
of 16 cm is 4 cm, so the area is 4 4 16 cm2
NUMINO Challenge D1
