Question

the base of an is isosceles traingle measueres 80 cm and it's area is 360cm .find the perimeter of the traingle.​

Answer 1

Step-by-step explanation:

Area of triangle =

2

1

×base×height=360 sq cm

2

1

×80×height=360

=> height =9 cm.

Since the height of the triangle, divides it into two right angled triangles,

a

2

=h

2

+(

2

b

)

2

=>a

2

=9

2

+(

2

80

)

2

=1681

Hence, a=41 cm.

Perimeter of the triangle = Sum of all sides = a + a + b =41+41+80=162cm

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