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Length for AF = 12 cm - 4 cm

= 8 cm

Area of triangle AFB = 1/2 X 8 X 6

= 24 cm^2

Length for DC = 9cm -6 cm

= 3 cm

Area of triangle BDC = 1/2 X 3 X 4

= 6 cm ^2

Total area of shaded region = 24 cm ^2 + 6 cm ^2 =30 cm ^2

Base of the triangle = 10 cm

Height of the triangle = 10 cm

Area of the triangle = 1/2 X 10 cm X 10 cm

= 50 cm^2

Area of the rectangle = 10 cm X 8 cm

= 80 cm ^ 2

Base of the triangle = 8 cm

Height of the the triangle = 3 cm

Area of the triangle = 1/2 X 8 cm X 3 cm

= 12 cm ^ 2

Total area = 80 cm ^2 + 12 cm ^ 2

= 92 cm^2