Tara has a tetrahedron puzzle that is 3 inches tall and has a surface area of 27.7 square inches. Victoria also has a tetrahedron puzzle, but its height is 12 inches. To the nearest tenth of a square inch, what is the surface area of Victoria's puzzle?

7200

aye bru this a great thing your doin here.

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

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