Six equilateral triangles are found in a regular 6 sided hexagon
there are 9
Infinitely many. Having found one triangle, you can find infinitely many similar triangles.
Archemides
Sometimes stars, triangles, rectangles, rhombuses or squares.
djfifrgrgre invented triangles
18 triangles can be found in a 20-agon
who found out congruency
8
Have a look around you?
there are 9
Six equilateral triangles are found in a regular 6 sided hexagon
Circles and triangles are both geometric shapes, and their areas can be found using certain formulas.
The diamond has four "rows". The first row has three triangles. The second and third rows have five triangles each. The last row has three. Click the middle triangle in the first row. Then click the middle triangle in the fourth row. Then click the first triangle in the third row. Then click the last one in the third row. Then click the first and last triangles in row 2. Click the first and last triangles in the first row. Click the 4th and 2nd triangle in the second row. Then click the 4th and 2nd triangles in row 3. Then click the first and last triangles in row 4. You're done.
Infinitely many. Having found one triangle, you can find infinitely many similar triangles.
Archemides
Pythagoras was interested in triangles when he found out that for any right angle triangle that when its hypotenuse is squared it is equal to the sum of its two squared sides.