21. Дана прямоугольная трапеция ABCD, в которой 2D = 90°,
Z ABD = LDBC = 60°, CD = b, BD = а. Найдите периметр трапеции.
а) b + 4а;
б) b + 2,5а;
в) 1,5b + 2а;
г) 2(b+a);
д) 3b + 0,5а.​
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