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You can use the 1/2 x a x b x SinC formula

Take 2 sides and an angle in between

You know the angles in an equilateral triangle are 60o each. All the sides are 8cm.

Plug the values of the sides into a and b

Plug the value of the angle into C. You get

1/2 x 8 x 8 x Sin60 = 27.7cm2

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Q: What is the area of an equilateral triangle whose sides measure 8cm?
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