Question

Find the area of triangle abc whose perimeter is 180 cm and two sides are 80cm and 18cm

Answer 1

find third side ,
80+18+c=180
c=82

now, Find semi perimeter so 180/2= 90

area = √s(s-a)(s-b)(s-c)
area =√90(90-80)(90-18)(90-82)

= √90×10×72×8
after calculation
9×80
720 cm^2 ans

Answer 2

Hi........
Here is your answer........
Perimeter of triangle = sum of all sides
180 = 80 + 18 + x
180 = 98 + x
180 - 98 = x
X = 82

Hope it helps you........
Don't forget to mark it as brainlist answer........

Bye........