Question

19. The perimeter of an equilateral triangle is 30 cm. Then its area is________​

Answer 1

Answer:

10root3/4 will be the area

Answer 2

Answer:

Perimeter - 30cm

Side - ? ( Each side is equal so Let each side be a)

Perimeter of Triangle = Sum of all 3 sides

30cm = a+a+a

30cm = 3a

30cm/3 = a

10cm = a

So, Each side = 10cm

Area of Eqilatetral Triangle = √3 ×a²/4 ×

= √3 × 10²/ 10

=> 43.3cm²(Approximate)

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