BIG IDEAS MATH GreenCC > Chapter 2: Surface Areas of Pyramids > Section Exercises 83 > Exercise 13
The entrance to the Louvre Museum in Paris, France, is a square pyramid. The site length of the bases 116 feet, and the height of one of the
triangular faces is 91.7 feet. Find the surface area of the four triangular faces of the entrance to the Loune Museum

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

d. corresponding side lengths in similar triangles are proportional in length.

step-by-step explanation:

except if the answer is in the value of money, then, it will matter. it will have to be $0.40, but i can tell this is not a money question, so .4 should be the right one.

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