Rani bought a new field that is next to one she already owns (Fig.). This field is in the shape of a square of side 70m. She makes a semi circular lawn of maximum area in this field. (i) Find the perimeter of the lawn. (ii) Find the area of the square field excluding the lawn. 

1 = 440

2 = 4900cm^{2}

Step-by-step explanation:

square = 280cm perimeter and area

semi circle would have radius = 70cm

perimeter of semi circle =

pi x (70x2) = 440cm

but if its with the square it would be 650cm

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

0.50 , 0.75

step-by-step explanation: