Question

Find the breath of a reatangle whose perimeter is 420cm and lenth is 21cm find also area

Answer 1

2(l+b)=420

(l+b) = 420/2

(l+b) = 210

(21 +b) = 210

B = 210 - 21

B = 189 cm

Area =lb

21*189

3969 Sq. Cm

Answer 2

The area is "3969 cm²" and the breadth is "189 cm".

Step-by-step explanation:

$The \ given \ values \ are:\\The \ perimeter \ of \ a \ recatngle,P=420 \ cm\\Length,L=21 \ cm\\As \ we \ know\\The \ perimeter \ of \ a \ rectagle,P=2(L+B)\\On \ putting \ the \ values \ in \ the \ above \ formula,we \ get\\420=2(21+B)\\\frac{420}{2}=21+B\\ 210=21+B\\B=210-21\\B=189 \ cm\\Now,The \ area \ of \ a \ rectangle,A=L\times B\\On \ putting \ the \ values \ in \ the \ above \ formula,we \ get\\A=21\times 189\\A=3969 \ cm^2$

Learn more:

https://brainly.in/question/15155147