Can someone help me whit this?!?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.