Question

Find the semi perimeter of a triangle with sides 90 m, 120 m, 150 m

Answer 1

Answer:

Correct option is

C

22 cm

Let a=20cm,b=15cm,c=9cm

And semi-perimeter =S

Now, S=

2

a+b+c

=

2

20+15+9

=

2

44

=22cm

∴ Semi-perimeter of triangle is 22cm.

Answer 2

Answer:

We know

Perimeter of a closed polygon=sum of all it's sides

here it's a triangle with sides 90,120,150

first we've to find perimeter

that is

perimeter=90+120+150

perimeter=360m

we know semi perimeter=half of the perimeter of a figure,that is 360/2

therefore the semi perimeter is 180m