Hello, cluap!
This requires some Trigonometry.
I hope you're prepared.
I'm trying to make an isosceles trapezoid with a base of 26 inches and an altitude of 16 inches.
The sides come in with a 6° (84° ngles).
What I'm trying to figure out is the length of the top section that parallels the base. Code:
B x C
* - - - - - *
/| |\
/ | | \
/6°| | \
/ |16 | \
/ | | \
/ | | \
/ 84° | | \
A * - - - * - - - - - * - - - * D
a E x F a
: - - - - - 26 - - - - - - :
We have isosceles trapezoid
The base is: .
The height is: .
Let: .
Let: .
Then: .
. . Hence: . .[1]
In right triangle
Substitute into [1]: .