Not 90°
the picture shows a cube. how big is the angel shown?

If you were to draw another line connecting the two top corners, you would make an equilateral triangle.

An equilateral triangle has 3 60 degree angles.

The angle = 60 degrees.

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.