# math

crystal wants to build a ramp that will rise 4ft over a horizontal distance of 20ft. how long will the ramp be? round to the nearest tenth.

1. 👍
2. 👎
3. 👁
1. Use the Pythagorean Theorem.

a^2 + b^2 = c^2
4^2 + 20^2 = c^2
16 + 400 = c^2
416 = c^2
c = sqrt 416
c = 20.4

If you draw a picture, you'll end up with a right triangle, and the two shorter sides are a and b, and the hypotenuse (long side) is c.

Do you get it?

1. 👍
2. 👎

## Similar Questions

1. ### geometry

A wheelchair ramp has a rise from the ground of 1 foot. The ramp has a length of 14 feet. To the nearest degree, find the angle the ramp makes with the sidewalk.

2. ### math

Your school is organizing a carnival. You are building a ramp for a game. The ramp will be 8 feet long with a total rise of 5 feet. Find the angle of elevation of the ramp.

3. ### precalculus

Your town's public library is building a new wheelchair ramp to its entrance. By law, the maximum angle of incline for the ramp is 4.76°. The ramp will have a vertical rise of 1.5 ft. What is the shortest horizontal distance that

4. ### physics

A solid sphere is released from the top of a ramp that is at a height h1 = 1.95 m. It goes down the ramp, the bottom of which is at a height of h2 = 1.38 m above the floor. The edge of the ramp is a short horizontal section from

1. ### Trigonometric Ratios

You are designing a ramp where the horizontal distance is twice the vertical rise. What will be the ramp angle to the nearest tenth of a degree?

2. ### physics

A 1.9 kg block slides down a frictionless ramp, as shown in figure 8-28. The top of the ramp is 1.5 m above the ground; the bottom of the ramp is .25 m above the ground. The block leaves the ramp moving horizontally, and lands a

3. ### Urgent! Pre-Cal

A wheelchair ramp with a length of 122 inches(top of ramp) and has a horizontal distance of 120 inches(bottom of ramp): a) what is the ramp's vertical distance(x)? b)Construction laws are very specific when it comes to ramps. Each

4. ### Physics

A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp. A)With what minimum speed must he drive off the horizontal ramp? The vertical height of the ramp is 1.5 m above the cars and the

1. ### math

Application The steps to the front entrance of a public building rise a total of 1 m. A portion of the steps will be replaced by a wheelchair ramp. By a city ordinance, the angle of inclination for a ramp cannot measure greater

2. ### math

A stunt motorcyclist makes a jump from one ramp 20 feet off the ground. The jump between ramps can be modeled by y= -1/640x^2 + 1/4x +20 where x is the horizontal distance (in feet) and y is the height above ground (in feet). I

3. ### math

A wheelchair ramp rises 5 feet over a horizontal distance of 15 feet. What is the slope of this ramp?

4. ### Physics

A luggage handler pulls a 20kg suitcase up a ramp inclined at 25o above the horizontal by a force of magnitude 140N that acts parallel to the ramp. The coefficient of kinetic friction between the ramp and the incline is 0.3. If