Triangles ABC and DEF are mathematically similar. A
B
9 cm
F
חו
13.5 cm
The area of triangle ABC is 34 cm?
Calculate the area of triangle DEF.
2
cm

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

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step-by-step explanation:

i believe that the answer is

b. y-1=-2(x-4)

hope this !

answer:   c ?

step-by-step explanation: