Want this question answered?
It's impossible to have an area in cubic units.
Find the area of an equilateral triangle that has a perimeter of 21 inches. Round the answer to one decimal place.
7.2
187.10
187.10
the answer is 32
For an equilateral triangle with side length a, area = (a²√3)/4, which for a= 6cm is 15.6 cm² [rounded to 1 decimal place]
12
Area of equilateral triangle: 0.5*7*7*sin(60 degrees) = 21.2 square inches
If there is a picture, it would be very useful, because the height and slant height are two sides of a right triangle. A good picture would show that the bottom side of this triangle is half the side length of the square. This is a leg of the right triangle: A=12' The hypotenuse of the triangle is the slant height: C=46' The "unknown" height is the other leg of the right triangle: B=? The pythagorean theorem A2+B2=C2 gives 144sqft+B2=2116sqft Solving for B gives B=44.4' Therefore, the height of the pyramid is 44.4 feet.
6.5- you round it until it has one decimal.
There is no need to round 1097 to any decimal places as there are no digits following a decimal point.