Question

in a figure ABCD. find the area of shaded region

Answer 1

is the right answer

Answer 2

in figure ABCD
CD =20cm

AB=AF+FB. .........A-B-C
AB=10+10=20
AB=CD=20cm

AB=CD=CD=AD ... as a condition in figure

ABCD in a square.

find area of square. In ∆CBF,.
angle CBF=90°
find area of ∆CBF .
find CF by Pythagorean theorom

subtract area of triangle from area of square