选择题
2025 AMC 8 Problem 24: Isosceles Trapezoid
In trapezoid ABCD, angles B and C measure 60° and AB = DC. The side lengths are all positive integers, and the perimeter of ABCD is 30 units. How many non-congruent trapezoids satisfy all of these conditions?
2025 AMC 8 第 24 题：等腰梯形
在梯形 ABCD 中，角度 B 和 C 均为 60°，且 AB = DC。 ABCD的边长均为正整数，周长为30个单位。有多少个非全等梯形满足所有这些条件
A.
0
B.
1
C.
2
D.
3
E.
4