Question

semi perimeter of an equilateral triangle is 30 cm. than its area is ​

Answer 1

Answer:

43.3cm²

Step-by-step explanation:

Perimeter of the triangle is given as 30 cm so the semi perimeter is equal to half of the perimeter i.e. 15 cm. Hence, the area of the triangle is equal to 9√15cm2.

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Answer 2

Answer:

Your answer would be 100√3

Step-by-step explanation:

If s = (a+b+c)/2

so perimeter will be 60 cm. (2*semi-perimeter)

Therefore, each of the sides will be 60/3 = 20 cm

Now Area = (side)^2 √3 /4

= (20)^2 √3 /4

= 400*√3/4

= 100 √3

= 100*1.73

= 173 cm^2