Question

EXERCISB 12.1
A traffic signal board, indicating 'SCHOOL AHEAD", is an equilateral trian
side 'a'. Find the area of the signal board, using Heron's formulu. If its per
180cm, what will be the area of the signal board?
lateral triangle
If its perimet​

Answer 1

Answer:

Step-by-step explanation:

side of tria is a

per of it is (a+a+a) = 3a

as question

3a = 180

or, a= 180/3

Then, a= 60

s= 3a/2

or, s= (3*60)/2

Then, s= 90

As Heron's Formula

area of trian, A= √s(s-a)(s-b) (s-c)

or, A= √90(90-60)(90-60)(90-60) [as a=b=c for equilateral triangle]

Then, A= √90*30*30*30

A= 30*30√30

A= 90√30

A= 493.2 cm²