Question

proportion deals with the relative size of within a whole.
similar figures are characterized by corresponding sides and equal corresponding angles.
the actual height of a person or object can be determined by using their shadow length and comparing it with the shadow of a known height, using triangles.
scale is a concept that lets us represent real objects with models or drawings, keeping sizes relative through a or fraction.

Explanation:

Step1: Analyze the first blank

Proportion is about parts in a whole. So the first blank is "parts".

Step2: Analyze the second blank

Similar figures have proportional corresponding sides. So the second blank is "proportional".

Step3: Analyze the third blank

To find height using shadows, similar triangles are used. So the third blank is "similar".

Step4: Analyze the fourth blank

Scale uses a ratio or fraction. So the fourth blank is "ratio".

Answer:

1. parts
2. proportional
3. similar
4. ratio