Because your right triangle is half of a rectangle, you would multiply one measurement by the other and then divide that by two. Then multiply that by 15 per square meter. Unfortunately, this will UNDER estimate your cost, as the triangular sail's hypotenuse is NOT a straight line. But it'll get you 'in the ballpark'.
A height of 4.2 meters
h square − 5h = 70
None, because there can be no such thing as a triangular square. If it is triangular it cannot be a square, if it is a square it cannot be triangular.
-- 5m x 3m = 15 square meters on the floor. -- Another 15 square meters on the ceiling. -- (10 x height of the room) on one pair of walls. -- (6 x height of the room) on the other pair of walls.
The area of the triangle in square meters is (1/2 the length of the triangle's base, in meters) times (the length of the triangle's height, in meters).
A height of 4.2 meters
height in meters multiplied by length in meters
The height of the triangle works out as 9 meters
h square − 5h = 70
Height is a linear measure and so "Square height" is a meaningless concept.
120 square meters
What is the area of a parallelogram with a base of 4 meters and a height of 10 meters?
There are many possibilities depending on its width which if it was 8 meters then its height would be 15 meters
15 meters
(Base X (Height)2) Divided by two
None, because there can be no such thing as a triangular square. If it is triangular it cannot be a square, if it is a square it cannot be triangular.
-- 5m x 3m = 15 square meters on the floor. -- Another 15 square meters on the ceiling. -- (10 x height of the room) on one pair of walls. -- (6 x height of the room) on the other pair of walls.