Article: The day you perform deep cleaning on the shingles should be cool and overcast. Sunlight and warm weather will ensure the cleaning solution dries too fast to be of any use. In addition, choose a day with little wind so that when you spray the solution, it stays on your roof. Before you begin, it’s important to repair loose shingles and flashings to minimize roof damage. Afterwards, clean out your gutters and downspouts. You’ll need the cleaning solution to drain off the roof during rinsing. Move any furniture away from the work area. If you’re using a bleach solution, also cover your yard. Rinse down your lawn and plants before you begin deep cleaning so the water dilutes harmful bleach, then cover them with plastic to catch any spray. Before you clean stains, you’ll have to climb up onto the roof and take off twigs, leaves, and anything else that would get in the way. Pick them up with your hand, use an air blower, or gently sweep them off with a broom.
Question: What is a summary of what this article is about?
Choose a cool and overcast day. Perform maintenance on your roof. Protect your yard. Remove debris from the roof.
Article: Do so by double-clicking on the blue Preview icon that looks like overlapping snapshots, then clicking on File in the menu bar and Open... in the drop-down menu. Select a file in the dialog box and click on Open. Preview is Apple's native image viewer app that's automatically included with most versions of Mac OS.  It's in the middle of the drop-down menu. It's in the middle of the drop-down menu. A text box with the word "Text" will appear in the middle of the document.  It's on the right side of the toolbar just above the document. A dialog box will open.  Click on the font drop-down to change fonts. Click on the colored-rectangle to change the color of the text. Click on the font-size to change the size of the text. Click on B to make the text bold, I to make the text italic, or U to underline the text. Use the buttons at the bottom of the dialog box to select an alignment for the text.   Your text additions are now saved in the PDF document.
Question: What is a summary of what this article is about?
Open a PDF document in the Preview app. Click on Tools in the menu bar at the top of the screen. Click on Annotate. Click on Text. Click on and drag the text to position it where you want it on the document. Click on A. Double click on the word "Text." Type the text you'd like to add to the PDF document. Click on File in the menu bar and Save in the drop-down menu.
Article: Having the right tools on hand will help this process go smoothly and quickly. To bend your sheet metal with a vise and hammer, you will need:  2 wooden or metal form blocks Block of hardwood and heavy-duty hammer or mallet (optional) Calculator or online bend calculator Marker Protractor Rubber, plastic, or rawhide mallet Ruler or tape measure Sheet metal Vise You can use a tape measure or ruler to measure the thickness of your sheet metal. This measurement will be necessary for calculating your bend allowance. If your sheet metal is too thick, you may need special machinery, like a brake or a torch, to bend your sheet into the desired shape. The bending you will be doing will warp your sheet metal so that it is physically bigger. To calculate the expansion that will take place on the outside of your bend angle, you will need to know your bend allowance. You can find your bend allowance with the following formula: (π/180) x B x (IR + K x MT) =  bend allowance (BA), where B is the angle complementary to your desired bend angle (1 to 180 degrees), MT is the thickness of the material, IR is the inside radius, and K is the K-factor.  To ascertain your K-Factor, inside radius, and material thickness (expressed as a decimal), you should use an Bend Allowance Chart. As an example, if you want to bend 24 gauge sheet metal at a 90° angle, the calculation would be: 0.017453 x 90 x (0.020 + 0.33 x 0.024) = 0.0438558984 inch bend allowance Keep in mind that some metals are more brittle than others. Bending a brittle metal beyond its limits could cause the metal to snap and break. Now that you know your bend allowance, take your protractor and draw a clear line with your marker across the point at which you will bend your sheet metal. Then use your bend allowance to draw your second bend line, the intervening distance between your bend lines (bend radius). The space between your bend lines will expand with the application of your bend. You should leave a little trim to your sheet, approximately ¼" is recommended. Be sure you file and smooth your sheet, as nicks and rough edges can cause cracks to form in your metal.
Question: What is a summary of what this article is about?

Gather your materials. Determine the thickness of your sheet. Calculate your bend allowance. Mark your bend lines. Cut your sheet to size.