Question

the perimeter of a isosceles triangle is 20cm two of it's equal side's are 7cm. find it's area​

Answer 1

Step-by-step explanation:

let the isoceles triangle∆ ABC

AB=AC

let the length of each two equal side be 2x

•°•AB=AC=2X

also , equal side is double than the base ..

so , BC =x

Now , AB+BC+AC=20 cm

•°• 2x + x + 2x = 20 cm

•°• 5x = 20

•°• x = 4 cm

Thus,

AB=AC=2x = 2×4 = 8

BC = x = 4 cm

Thus the length of two equal side is 8 cm and the length of the base is 4 cm