24. The volume of prismatoid is given by this formula:
V=6L(A1+4Am+A2)where
A1 and A2= areas of parallel bases
Am= area of the section midway between A1 and A2
L= the altitude
V=6100(90+4(120)+210)=13000(cm3) c) 13 000 cm3
25. a=12 cm,b=20 cm,h=14 cm
cotα=a/2x=m/2x+h/2=b/2x+h
bx=ax+ah
x=b−aah=20−1212(14)=21(cm)
m=xa(x+h/2)=2112(21+14/2)(cm)=16(cm)
Am=m2=(16)2=256(cm2) c) 256 cm2
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