A flagpole casts a shadow 15 feet long. The 6-foot tall man casts a shadow 4.5 feet long. How tall is the flagpole?

20 feet

Step-by-step explanation:

If a 6-foot tall man casts a 4.5-foot long shadow, the ratio of height to length is 6:4.5 or 4:3. Thus, since the flagpole shadow is 15 feet tall, we multiply by 4/3 to find the height to be 20 feet.

step-by-step explanation:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.