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FrozenT [24]
3 years ago
6

A triangular prism has an isosceles right triangle as a base. The volume of the prism is 342.1 cm3. Find the measure of one of t

he legs of the base if the height of the prism is 13.2 cm. Round to the nearest tenth.
3.6 cm
7.2 cm
5.1 cm
6.2 cm

Mathematics
1 answer:
vazorg [7]3 years ago
5 0
The triangle has sides "a", "b" and "c", where side a = side b and the hypotenuse (side "c") equals side "a" or "b" times the square root of 2.

Prism volume = triangle area * height
342.1 = triangle area * 13.2
triangle area =  342.1 / 13.2
<span><span><span>triangle area =  25.9166666667 </span> </span> </span>

area of a triangle is (1/2) base * height
In a 45 45 90 triangle, the base = height and since we don't know either the base or the height we'll call both "x".
So triangle area = (1/2) * x^2
<span>25.9166666667 = (1/2) * x^2
x^2 = </span><span>51.8333333334
x ( the base and the height) = </span><span><span><span>7.1995370222 </span> </span> </span> <span> </span>  
the hypotenuse of a 45 45 90 triangle = leg * square root (2) =
hypotenuse = <span>7.1995370222 * sq root (2)
</span><span><span><span>hypotenuse = 10.1816828995 </span> </span> </span>

So, one of the legs = <span><span>7.1995370222 </span>

Source:
http://www.1728.org/triprism.htm
</span>


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