only question number 10 solve
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Answer:
area trapezium= 1/2*h*(b1+b2)
h= 8 cm
b1= 10 cm
b2=12cm
area= 1/2*8*(10+12)
=4*22=88 cm^2
area rectangle= l*b
l=12cm
b=10 cm
area=10*12 =120cm^2
now area of octagon = 2(area trapezium)+(area rectangle)
=2*(88)+(120)= 176+120= 296 cm^2