Question

Can anybody help me find out how to get the other marks on this question please?

Answer 1

P = 40cm => l = 40 : 4 = 10cm

A(red) = 10*3/2 = 15 cm²

A(blue) = 10*6/2 = 30 cm²

A(grey) = A - (Ar + Ab) = 10*10 - (15+30) = 100 - 45 = 55cm²

(A)100cm² ..............100%

(Ag)55cm²..................x%

Ag = 55*100/100 = 55%

Answer 2

the percentage is 55/100*100=55%

Explanation:

the segment of the square is 40/4=10 cm

so the area of the square is 10^2=100cm^2

the shaded area = the area of the square - the sum of the areas of the triangles inside the square

100- (10*6/2+10*3/2)=100-(30+15)=55 cm^2