Given Isosceles trapezoid ABCD. AB = 3x - 4 and CD = x + 12. Find AB.

Question

Isosceles trapezoid A B C D is drawn.

2

8

16

20

Answer 1

AB = 3X - 4.

CD = X + 12.

The non-parallel sides of an isosceles trapezoid are equal:

AB = CD,
3X - 4 = X + 12,
3X - X = 12 - 4,
2X = 8,
X = 4.

AB = 3X - 4 = 3 * 4 - 4 = 8.

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