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Q: What is the area of an equilateral triangle that has a perimeter of 21 inches rounded to one decimal place?

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It works out as 22.335 feet rounded to three decimal places

Area of equilateral triangle: 0.5*8*8*sin(60 degrees) = 27.7 square inches rounded

For an equilateral triangle with side length a, area = (aÂ²âˆš3)/4, which for a= 6cm is 15.6 cmÂ² [rounded to 1 decimal place]

Area of equilateral triangle: 0.5*6*6*sin(60 degrees) = 15.6 square cm rounded

It is: 0.5*7.5 square*(sin 60 degrees) = 24.357 square cm rounded up to 3 d.p.

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Perimeter of equilateral triangle: 24 units Area of equilateral triangle: 27.713 square units rounded to three decimal places

It works out as 22.335 feet rounded to three decimal places

Area of equilateral triangle: 0.5*8*8*sin(60 degrees) = 27.7 square inches rounded

For an equilateral triangle with side length a, area = (aÂ²âˆš3)/4, which for a= 6cm is 15.6 cmÂ² [rounded to 1 decimal place]

Area of equilateral triangle: 0.5*6*6*sin(60 degrees) = 15.6 square cm rounded

Area = 0.5*7.52*sin(60 degrees) = 24.357 square cm rounded to 3 dp.

It is: 0.5*7.5 square*(sin 60 degrees) = 24.357 square cm rounded up to 3 d.p.

Using Pythagoras' theorem its height works out as 17.321 inches rounded to 3 decimal places

Its 3rd angle is 77 degrees and by using the sine formula for a triangle its 2 other sides are 4.2cm and 3.8cm both rounded to 1 decimal place which means it has a perimeter of 13cm and its area works out as 7.81 square cm rounded to 2 decimal places.

It has a perimeter of 24 units and an area of 27.713 square units rounded to 3 dp

5 sqrt(3) = 8.66 (rounded)

Using the sine rule a/A = b/B = c/C the perimeter of the triangle works out as 13.98 cm rounded to two decimal places

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