Question

the perimeter of an isosceles triangle is 20cm. if each equal side id double the base find the sides

Answer 1

the answer sholud be :-
equal sides= 8cm 
base= 4cm

perimeter = 8 + 8 + 4 = 20cm

Answer 2

Let the isosceles triangle be ΔABC and AB = AC.

Let the lengths of each of two equal sides be 2x.
∴AB = AC = 2x

Also, each equal side is double than the base.

So, BC = x

Now, AB + BC + AC = 20 cm
∴2x + x + 2x = 20
∴5x = 20
∴x = 4cm

Thus,
AB = AC = 2x = 2*4 = 8 cm
BC = x = 4cm

Thus, the lengths of two equal sides is 8 cm and the length of base is 4 cm.