Question

the semi perimeter of an equilateral triangle is 15 cm, then find its area. WITH PROCEDURE PLZ.​

Answer 1

semi perimeter= 15

then,

perimeter of the equilateral triangle = 15×2

= 30cm

then,

perimeter of equilateral triangle= 3 × side

30 = side

3

10cm = side

area = √s(s-a)(s-b)(s-c)

=√15 (15-10)(15-10)(15-10)

= √15 ×5 ×5×5

= 5×5√3

=25√3

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Hope it will help you.

Answer 2

Answer:

total perimeter of equilateral triangle = 15×2

= 30 cm

so perimeter of traingle = 30cm

3 × side = 30

side = 10 cm

Now area of euquilateral triangle = √3/4 × side^2

= √3/4 × 100

= 25√3 cm2

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