Use Pythagoras' theorem to find the triangle's altitude or height:
122-62 = 108 and the square root of this is 10.39230485
1/2*base*height = area
1/2*6*10.39230485 = 31.17691455 square units
Chat with our AI personalities
Area of a triangle = 1/2 * Base * Height = 1/2 * 12 * 6.5 = 39 cm2
An equilateral triangle has 3 equal interior angles each of 60 degrees. There are two right angled triangles in an equilateral triangle. So we can use trigonometry to find the length of one side of the equilateral triangle then multiply this by 3 to find its perimeter. Hypotenuse (which is one side of the equilateral) = 15/sin 60 degrees = 17.32050808 17.32050808 x 3 = 51.96152423 Perimeter = 51.96152423 units.
To find the surface area of an equilateral triangular prism you take the area of the rectangular sides and the triangular bases and add them up and your done.
TriangleA a=90.6 TriangleB a=188.9 90.6/188.9 = .48 I think this is right, not completely sure though.
The length of each side is 9.2376 cm. (rounded)