Question

what is the perimeter of a triangle which two sides are 30cm and one side are 40 cm​

Answer 1

Answer:

Answer is 600sq cm

Step-by-step explanation:

Let third side be x cm.

Perimeter of triangle = 120

40+30+x=120

70+x=120

x=120-70=50 cm

Now we see that (50)^2=(40)^2+(30)^2

So it is a rightangle triangle whose base and perpendicular are 40cm and 30cm respectively.

So we needn't to use heron formula to calculate the area of triangle.

Area of a right angle triangle =(base×perpendicular)/2=(30×40)/2=1200/2=600 sq. cm

Hope it will help you.