Question

perimeter of a rectangle is a 90 cm one side is 20 cm what is the area in square centimetre​

Answer 1

$\huge{\underline{\bf Answer:}}$

$\large{\boxed{\mathsf{Given \: that -}}}$

Length of rectangle = 20 cm

Perimeter = 90 cm

⇒ 2(l + b) = 90

⇒ 2 (20 + b) = 90

⇒ 20 + b = 45

⇒ b = 45 - 20

⇒ b = 25 cm

$\fbox{ \large{ \star \sf \: Breadth = 25cm}}$

We know that ;

$\sf Area \: of \: Rectangle = l \times b \\ \\ \implies \sf Area = 20 \times 25 \\ \\ \boxed{ \huge {\sf Area = 500 \: cm {}^{2}}}$

Answer 2

Answer:-

Perimeter=90cm

One side =20

perimeter of rectangle=2(l+b)

90=2(20+b)

90÷2=20+b

45-20=b

25=b

BREADTH=25CM

Area of square=side×side

25×20

$500cm{}^{2}$

Hope it's help uh