Page 82 - NUMINO Challenge_D1
P. 82
Problem solving Key Points
1 A regular tetrahedron is cut across a line that is The top figure is a
parallel to its base. Draw the net for each solid triangular pyramid,
figure. and the bottom
figure is the frustum
of a triangular
pyramid.
2 Ink is poured into a cube that is tilted to one Mark the vertices of
side. Color the parts that are stained by the ink the net of the cube
on the net of the cube. with letters. Then
find out which parts
are stained with ink.
EH E H E
EA DH
DF G
A F B CG F
BC
CB
79Geometry
1 A regular tetrahedron is cut across a line that is The top figure is a
parallel to its base. Draw the net for each solid triangular pyramid,
figure. and the bottom
figure is the frustum
of a triangular
pyramid.
2 Ink is poured into a cube that is tilted to one Mark the vertices of
side. Color the parts that are stained by the ink the net of the cube
on the net of the cube. with letters. Then
find out which parts
are stained with ink.
EH E H E
EA DH
DF G
A F B CG F
BC
CB
79Geometry
