15 and 28
28 and 15
45
Two right-triangular prisms.
A Triangular Prism
A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.
The two triangular numbers that sum to 43 are 28 and 15. Triangular numbers are formed by the formula ( T_n = \frac{n(n + 1)}{2} ). For this case, 28 corresponds to ( T_7 ) (when ( n = 7 )) and 15 corresponds to ( T_5 ) (when ( n = 5 )). Thus, ( T_7 + T_5 = 28 + 15 = 43 ).
28 and 15
45
43 at the base, 1 at the top
No, Triangular prisms have two bases that are triangular but these need not be equilateral.
a triangular prism is a prism that has two triangular figures and three rectangular shapes.
A triangular prism.
squared
The triangular prism has the two triangular bases and rectangular side faces.
a triangular prism * * * * * or a triangular dipyramid (two triangular pyramids stuck together).
Triangular prism
A triangular prism has two triangular faces and 3 rectangular faces