a roof
One difference: An octahedron has 8 faces, a triangular prism has 5. An octahedron (="eight faces") is a regular high-symmetry solid with all the faces identical. A triangular prism has a triangular base, a triangular roof, and 3 rectangular sides (walls).
Divide the shapes, so you're left with a triangular prism, and a rectangular prism. Calculate the slope of the triangle as per usual.
A block of cheese,house roof,a ten,A paper boat
An A-Frame
a roof
roof
Roof of a house
One difference: An octahedron has 8 faces, a triangular prism has 5. An octahedron (="eight faces") is a regular high-symmetry solid with all the faces identical. A triangular prism has a triangular base, a triangular roof, and 3 rectangular sides (walls).
toblerone, roof, cheese, open book upside down
Divide the shapes, so you're left with a triangular prism, and a rectangular prism. Calculate the slope of the triangle as per usual.
A block of cheese,house roof,a ten,A paper boat
A basic camping tent, a house roof, and the iconic Toblerone box.
A gabled roof is the triangular portion of a wall between the edges. It is the sloping roof. Thus the type of enclosing roof the volume dictates the shape of the gable. If you built a room over the roof is not possible. So you replace the roof and raise walls and ceiling of the room and replace the roof.
Gable is the normally triangular portion of a wall between the edges of intersecting roof pitches. The shape of the gable & how it is detailed depends on the structural system used, which reflects climate, material availability, and aesthetic concerns.
In places like a desert a lot of times they aren't, because they don't have a lot of rain and they don't really get snow, but in places like Michigan, our roofs might collapse with the weight of all the snow we get in the winter so make them in the shape of a triangular prism so the snow wont really stay on the roof, but there are still some people who make their roofs flat for whatever reason.
It depends on the prism. A prism that has a regular pentagon as base but is not a right prism has no right angles. At the other extreme, consider a right prism whose bases are pentagons that resemble a child's drawing of a house (square with a triangle roof). If the angles of the roof triangle are 90-45-45, the prism will have 22 right angles.