That is a hip roof.
Valley.
The Pentagon in Washington DC. Technically, it has 7 sides, the roof and floor is a side also.
An irregular pentagon such as a child's silhouette of a house: a rectangle shape (open at the top) forming the body of the house, with a triangular roof on of the rectangle. The vertical line through the apex of the roof is the line of symmetry. The two walls, and the two roof lines are the two sets of equal sides. The two right angles at the base are the one set of matching angles.
In road building, to make sure the road isn't too steep. Roof of a building has a slope so that rain will run off.
If the roof has equal pitches [both sides same size] Multiply the length of the roof by length of truss [take size from gutter to ridge] multiply these two sizes in feet then double the answer. that will be your answer.
A mansard roof is difficult to install due to its shape and structure. What makes a mansard roof so difficult to install is that there are 4 sides all of which have different slopes.
A hip roof has a slope on all four sides. A gable roof only has it on two sides. On the short sides of the house the side wall goes up to the point of the roof.
A gambrell roof is a gabeld roof with double slopes on each side. The lower slopes have steeper pitches than the upper upper slopes.
A hip roof, or hipped roof, is a type of roof where all sides slope downwards to the walls, usually with a fairly gentle slope. A square hip roof is shaped like a pyramid. Hip roofs on rectangular houses will have two triangular sides and two trapezoidal ones. A hip roof on a rectangular plan has four faces.
A roof with only two sloping surfaces and gables at each end is called a gable roof.
A roof with two slopes and gables at each end is commonly referred to as simply, a gable roof.
If the gable is formed by the two slopes and a horizontal line, it is called a gable roof.
Valley.
Yes. A roof with 4 planes could be a hip roof - all four sides of a rectangle building have a slope as opposed to a gable which is sloped only to 2 sides, and therefore has 2 planes. It could also be a gambrel roof which is like a roof on a barn.
gambrel
Which gently slopes from roof peak to eaves helps to combat bittrer winter winds
Concave roof is a roof in the form of a dome or circular shape. A concave roof is one which slopes downward toward the center. You can remember this by thinking the roof is "cave"-ing in.