Question

2.
Three squares have the dimensions indicated in the
diagram. The area of the quadrilateral ABCD is:
5
3
2.
B
C
A
D
21
15
(1)
(2)
4
4
21
(3)
(4) Data not sufficient
2​

Answer 1

IN a equilateral triangle ABC,AD perpendicular BC,prove that AD square = 3BD square