Question

find the area of the isosceles triangle if the perimeter is 11 and base is 5 cm​

Answer 1

Step-by-step explanation:

let the equal sides be=x

base=5

perimeter=11

perimeter=sum of all sides

11=x+x+5

11=2x+5

11-5=2x

6/2=x

3=x

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Answer 2

Answer:

15/2 cm^2  or 7.5cm^2

Step-by-step explanation:

Perimeter of isosceles triangle = (2a + b ) (since two sides are equal)

Perimeter = 11cm  , base = 5cm

11 = 2a + 5 ;     6 = 2a  ;     a = 3cm

Area = 1/2 x base x height

Area = 1/2 x 5 x 3

Area = 15/2cm^2   or 7.5am^2