Question

The perimeter of an isosceles triangle is 30 cm .The length Of its
congruent sides is 3cm more than its base .find the length of all the side

Answer 1

let the length of base is x than the the length of congruent side is x +3

ATQ

$(x + 3) + (x + 3) + x = 30 \\ 3x + 6 = 30 \\ 3x = 30 - 6 \\ 3x = 24 \\ x = 8$

base = x= 8

congruent side =x +3=11

Answer 2

Hope it helps...

The answer is attached.

Perimeter =30cm

Let the length of the base be x cm and the length of the concurrent sides be y cm.

y=3+x

y+y+x=30cm

3+x+3+x+x=30

3x+6=30

3x=30-6

3x=24

x=8

Base=8 cm

Concurrent sides =3+8=11cm