Question

each side of a equilateral triangle is 10cm find its height and area plz explain that why everyone in multiplying its area to 10 i didnt understand class 9

Answer 1

Answer:

Step-by-step explanation:

let ABC be the equilateral triangle of side 10 cm.

draw AD perpendicular to BC

AB = 10cm

AD = x

BD= 5cm ( since altitude of a equilateral triangle divides the base into equal halves)

AD^2 = AB^2  - BD^2

         = 10^2 - 5^2

         = 100-25

       AD^2  = 75

                    = 5√3 cm

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