What is the area of this shape the shape was 100in2 then a corner was cut ​

Step-by-step explanation:

The figure above shows a piece of cheese with a corner cut off to expose plane surface ABC. What is the area of surface ABC?

AD = 10 centimetres

The shape of the cheese was a cube before the corner was cut off

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have