Puzzles - Triangles

1. Here 9 matchsticks have been used to form four congruent triangles. Now arrange only 6 matchsticks to four congruent triangles.

Puzzles – Triangles - Solution

1. Here 9 matchsticks have been used to form four congruent triangles. Now arrange only 6 matchsticks to four congruent triangles. Tetrahedron

2. Here 12 matchsticks have been used to enclose an area of 9 squares. Draw four diagrams toshow how 12 matchsticks can be used to enclose areas of 8, 7, 6, and 5 squares.

2. Here 12 matchsticks have been used to enclose an area of 9 squares. Draw four diagrams to show how 12 matchsticks can be used to enclose areas of 8, 7, 6, and 5 squares.