# Math 9

posted by .

A 6 m flagpole casts a 5 m shadow at the same
time of the day as a building casts a 28m
shadow. How tall is the building?

I drew out a flag and a building, with a shadow coming from the top to the ground. What do i do next?

• Math 9 -

Use proportions.
The height of the building can be x.
6/5=x/28
Cross multiply.
6*28=5x
168=5x
Divide each side by 5 so you isolate x.
168/5=x

## Similar Questions

1. ### CALCULUS

At 3:00 PM a man 144 cm tall casts a shadow 146 cm long. At the same time, a tall building nearby casts a shadow 171 m long. How tall is the building?
2. ### trig

A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?
3. ### Math(trig)

A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?
4. ### math

A pole that is 2.9m tall casts a shadow that is 1.39m long. At the same time, a nearby building casts a shadow that is 36.75m long. How tall is the building.
5. ### GEOMETRY

If a building casts a 20 ft shadow and a flagpole casts a 7 ft shadow and the flagpole is 12 ft tall, how high is the building?
6. ### Pre-algebra

A pole that is 3.1m tall casts a shadow that is 1.64m long. At the same time, a nearby building casts a shadow that is 50.25m long. How tall is the building?
7. ### math

A 60–ft building casts a shadow that is 12 ft long. How tall is a building that casts a shadow of 17 ft at the same time of day?
8. ### Math

In the diagram, a building casts a 20-ft shadow and a flagpole casts a 7-ft shadow. If the flagpole is 12 ft tall, how high is the building?
9. ### Geometry

In the diagram, a building casts a 35-ft shadow and a flagpole casts an 8-ft shadow. If the flagpole is 18 ft tall, how tall is the building?
10. ### math

At 3:00 PM a man 146 cm tall casts a shadow 136 cm long. At the same time, a tall building nearby casts a shadow 177 m long. How tall is the building?

More Similar Questions