Practicing Success
Find the number of triangles in this figure? |
12 15 16 18 |
18 |
Smaller triangles = (ABC) , (ACD) , (ADE) , (FGJ) , (GHJ) , (HIJ) Triangles made by combination of 2 triangles = (ABD) , (ACE) , (AFG) , (AGH) , (AHI) , (FHJ) , (GIJ) Triangles made by combination of 3 triangles = (ABE) , (FIJ) Triangles made by combination of 4 triangles = (AFH) , (AGI) Triangles made by combination of 6 triangles = (AFI) Thus, total triangles = 18 |