For an isosceles triangle having base b and each of the equal sides as a, we have:

I. Area =

II. Perimeter = (2a +b)

III. Height =

Which of the following is true?

According to question, we have:

Base of triangle = b

Equal sides of triangle = a

∴ Area =

Perimeter = (2a + b)

And, Height =

∴ I, II and III are true

Hence, option (d) is correct

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