Question

find the area of an equilateral triangle whose length of its side is 12cm

Answer 1

Area of equilateral triangle : √3a^2/4
= √3 (12)^2/4
=144 √3/4
=36 √3 is Answer

Hope it helps. ..!!

Answer 2

Answer:

Step-by-step explanation:

length of equilateral triangle is 12 cm

let triangle ABC be equilateral traingle

AB=BC=AC=12 cm

and BD bisect at side BC such that

BD=DC=6 cm

therefore in triangle ADB, by hypotenuse therorem

AB^2=AD^2+BD^2

12^2=AD^2+36

AD^2=108

therefore AD=6$\sqrt{3}$

hope it helps........