Question

perimeter of a rectangle in the figure
is 36 cms.
a) what is AB +BC ?
b) find the length of AB

urgent plz helpp​

Answer 1

Answer:

P= 2[l+b]

36=2(l+b)

18=l+b

AB+BC= 18

Step-by-step explanation:

Answer 2

Perimeter = 36 cm

diagonal AC = √164 = √(41*4)=2√41 cm.

AB+BC= 36/2=18.

(AB+BC)^2=18^2

AB^2+BC^2+2*AB*BC=(20-2)^2=400–80+4=324

AB^2+BC^2=AC^2=(√164)^2=164

164+2*AB*BC=324

2*AB*BC=324–164=160

AB*BC=80

(AB-BC)^2=AB^2+BC^2–2*AB*BC=164–2*80=4

AB-BC=2

AB+BC=18

2AB=20

AB =10

BC =8

AC =√164

AB+AC =10+√164 cm

AB= 10 cm