Page 157 - NUMINO Challenge_D1

Answer Problem solving
Key
1 Draw the net of a triangular prism and the
4
frustum of a triangular pyramid.
Regular octahedron

9 Section a of Solid Figure p.76~p.77

Example triangle quadrilateral
pentagon 5
2E H
TryItAgain If the middle points of the 4 edges are DH E
connected, a square is made. EA
CG F
FB C B

Answers will vary. Type 9-2 Numbers of Faces, Edges, and Vertices p.80~p.81

Example pentagon 32, 5, 90, 4, 60 1 Faces: 6, Edges: 12, Vertices: 8
12, 32
12, 20 90, 60 2 The number of edges increases by 3 and the
number of vertices increases by 2.
Type 9-1 Net of a Cut out Solid Figure p.78~p.79
3 Faces: 6 1 7, Edges: 12 3 15,
1 Equilateral triangle Vertices: 8 2 10
4 regular hexagons, 4 equilateral triangles
4 The number of faces increases by 1 and the
2 number of vertices decreases by 1.

5 Faces: 6 1 7, Edges: 12, Vertices: 8 1 7

3

NUMINO Challenge D1