Graphic area s =1/2 * 3.5 * 3.5+(2.5+3.5) * 4/2 =18.125m?
(2) Graphic area = square area+parallelogram area
=4*4+4*3=28m？
2.( 1) Coloring area = trapezoid area-triangle area
=(2.4+3.6)*2/2- 1/2*2.4* 1.2
=6- 1.44
=4.56cm？
(2) Colored area = rectangular area-trapezoidal area
=36*24-( 18+(36-6))*(24-8)/2
=864-384
=480cm？
3. The G point is AB vertical GH and the vertical foot is H. ..
AH=DG=3，AD=GH=BC=4
FB⊥AB
δAGH∽δAFB
BF:GH=AB: ah
BF=8/3*4=32/3
CE=BF=32/3
BE=BC+CE=4+32/3=44/3
CG=CD-DG=8-3=5
CF=BF-BC=32/3-4=20/3
Colored area = trapezoidal ABED area-rectangular ABCD area-triangular CFG area
=(4+44/3)*8/2-4*8- 1/2*5*20/3
=224/3-32-50/3
=78/3cm？
4. Expanded area =(20+5)*( 15+3)=450m?