INPUT ARTICLE: Article: A long walk may be too much activity at first. Instead, take as many short walks as you can during the day. Walk around the block in the morning or evening. During lunch, stroll around the building. Take breaks throughout the day to walk to the restroom or to get a drink of water.  If you are on crutches, talk to your doctor about the best way to stay active during your recovery period. Walking on a treadmill or elliptical can also help improve your strength while recuperating from a hyperextended knee. Swimming is a gentle activity that is easy on your knee joints. Do laps around a pool. If swimming is too much for you, you can also try water walking by simply walking around the pool. The water will relieve the pressure on your joints. Cycling is a great low-impact activity that can keep your knees mobile while you heal. You can ride a normal bike or use a stationary bike. Start slowly by cycling for 5-10 minutes. Work your way up until you can do 20-30 minutes at a time.

SUMMARY: Take short walks throughout the day. Exercise in the pool. Ride a bike.

In one sentence, describe what the following article is about: Find a piece of metal that is about as thin as a credit card. This "shim" should be narrow enough to fit into the locking mechanism on the cuffs. The metal clip on a pen could serve as a "shim," for instance.
Summary: Find a flat piece of metal.

INPUT ARTICLE: Article: The formula is D=w2+l2{\displaystyle D={\sqrt {w^{2}+l^{2}}}}, where D{\displaystyle D} equals the length of the rectangle’s diagonal, l{\displaystyle l} equals the length of the rectangle, and w{\displaystyle w} equals the width of the rectangle.  This method will only work if you are given the length of the diagonal and the length of the side of the rectangle. You might also see the formula written as D=w2+h2{\displaystyle D={\sqrt {w^{2}+h^{2}}}}, where h{\displaystyle h} equals the height of the rectangle and is used instead of length. The variables l{\displaystyle l} and h{\displaystyle h} refer to the same measurement. Make sure you substitute for the correct variables. For example, if you are trying to find the width of a rectangle that has a diagonal length of 5 centimeters, and a side length of 4 centimeters, your formula will look like this: 5=w2+42{\displaystyle 5={\sqrt {w^{2}+4^{2}}}} You need to do this to get rid of the square root sign, which makes isolating the width variable easier. For example:5=w2+42{\displaystyle 5={\sqrt {w^{2}+4^{2}}}}52=w2+42{\displaystyle 5^{2}=w^{2}+4^{2}}25=w2+16{\displaystyle 25=w^{2}+16} To do this, you need to subtract the squared length from each side of the equation. For example, in the equation 25=16+w2{\displaystyle 25=16+w^{2}}, you would subtract 16 from each side.25=16+w2{\displaystyle 25=16+w^{2}}9=w2{\displaystyle 9=w^{2}} To do this, you need to find the square root of each side of the equation. For example:9=w2{\displaystyle {\sqrt {9}}={\sqrt {w^{2}}}}3=w{\displaystyle 3=w} Don’t forget to include the unit of measurement. For example, for a rectangle with a diagonal length of 5cm{\displaystyle 5cm} and a side length of 4cm{\displaystyle 4cm}, the width would be 3cm{\displaystyle 3cm}.

SUMMARY:
Set up the formula for the diagonal of a rectangle. Plug the values for the diagonal and side length into the formula. Square both sides of the formula. Isolate the w{\displaystyle w} variable. Solve for w{\displaystyle w}. Write your final answer.