Question

Ch: Perimeter and Area

Answer 1

2)area of square = s×s
=20×20
=400cm^2
area of FEA = 1/2×10×10
= 50cm^2
area of CBE = 1/2×10×20
=100cm^2
area of DCF =100 cm^2
therefore area of shaded part =150cm^2

Answer 2

now,

2.
→ area of AEF =1/2×B×H

=1/2×10×10
=5×10
=50cm²

→ area of EBC=1/2×B×H

=1/2×10×20
=5×20
=100cm²

→ area of DFC=1/2×B×H

=1/2×10×20
=5×20
=100cm²

→ area of ABCD=side×side

=20×20
=400cm²

hence area of the shaded region=400-(50+100+100)
=400-250
=150cm²

hope this helps u...!

above part is in the pic...