
William W. answered 02/05/24
Experienced Tutor and Retired Engineer
On both "ends" of this trapezoid are right triangles:
You can use the Pythagorean Theorem to solve for "a":
a2 + 172 = 192
a2 + 289 = 361
a2 = 361 - 289
a2 = 72
a = √72 = 6√2
So take away 6√2 on both sides from the total of 31 to get x = 31 - 6√2 - 6√2 or a = 31 - 12√2
You can plug this into a calculator to get the approximate numerical value of 14.03
Puppies U.
thank you!02/06/24