Question

In the quadrilateral ABCD AngleB = 90° and AD^2= AB^2+BC^2+ CD^2.Then angle ACD is

80 degree
90 degree
100 degree
120 degree

Answer 1

Answer:

90 degree

Step-by-step explanation:

AB^2+BC^2 =AC^2 (PYTHAGORAS LAW)

AD^2 = AB^2+BC^2+CD^2

=AC^2+CD^2

It satisfies pythogoras law

angle ACD is 90 degree