Please state the width (part a)
And length (part b)

(a) = 71 cm

(b) = 89 cm

Step-by-step explanation:

(a.)

perimeter of a rectangular field = 324 m

length (l) = 91 m

width (w) = ?

Now,

Perimeter Of Rectangle

= P = 2(l + w)

= 2(91 + w) = 324m

= 182 + 2w = 324m

= 2w = 324 - 182m

= 2w = 142m

= w = 142/2

= w = 71

(b.)

area of rectangular painting = 5696 cm²

width (w) = 64 cm

length (l) = ?

Now,

Area Of Rectangle

A = l × w

= l × 64 = 5696

= l = 5696/64

= l = 89 cm

FOR (a)

= P = 2(l + w)

= P = 2(91 + 71) = 324 cm

FOR (b)

= l × w

A = 89 × 64 = 5696

450 is the final answer! : )

just sum

10 + 10 = 20