Question 1

How do you anchor it on patio?

Accepted Answer

You need to provide some fairly strong solid supports like 6" x 6" posts or a tree to fasten it to. You may find the hardware a bit undersize if it comes with any.  Get some good strong 3/8" or 1/2" screw eye hook lags that screw into the post, or drill all the way through the posts and put an eye hook bolt with nut and washers.  The sudden winds nowadays will bash it pretty badly at odd times so prepare for that by using strong anchors.  You may be able to fasten the high side to the house or porch if it is a strong installation.  Stay with fairly sturdy stuff, not just 3/16" or 1/4" eye hooks.

Question 2

What posts should I use, and how tall for the 12x12x12 triangle?

Accepted Answer

I did not use Posts, this Tiny Garden Patio did not have space for posts yet needed SHADE from E to  W Dallas, TX sun.
I had 5 U Brackets strategically screwed onto home's South side just under the overhang.
then I had a 2 blocks made. They were screwed down into the Top of my -8' fence with 3" galvanized screws; 
to these blocks 3 more brackets were mounted with 4- - - 1.5" galvanized screws.
I have 2 triangles + 1 rectangle  Sun Shade Sail in a 10x11 foot area. Over lapping for Extra East to West Sun Protection.  Dallas, TX
Yesterday a guy friend was over & with his help we positioned the 3rd sail after  pondering & a few more Bungees.
Putting the sails up overlapping does require out of the box thinking . . . .
I LOVE my 3 Sail Shades & so do my flowers & Kitty Cat. 
The rectangle is in the Middle the Triangles on Top & 1 on Bottom in contrast Positions.
Each sail:"fixing ring" attaches to U bracket with sturdy Bungee Cords.  
I used all sizes of bungees some doubled & tied through ring - then 2 bungee hooks go on U bolt.  
Works PERFECT allows sails to move, flex as needed, yet be stretched out perfectly as you want.
2 Brackets were also mounted mid way down my fence along 2x4 - when rain or bad winds blow in; I move NORTH side of sails Down.
Facilitates rain to run down off shade + helps keep wind from getting up under shades.  Once storm moves off, sails dry&  back up on TOP Fence Brackets the bungees go.
Easy Breezy.

Question 3

what is the exact size of the sail

Accepted Answer

It tells you the exact size of the sale in the information before you purchase it

Question 4

Is the hardware (rings) stainless steel? Rustproof?

Accepted Answer

yes, all of the hardware is stainless steel, no rust.

ASIN	B07H76BZW8
Best Sellers Rank	#2,883 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Shade Sails
Brand Name	SUNNY GUARD
Color	Sand
Customer Reviews	4.5 4.5 out of 5 stars (12,010)
Item Highlight	Sun shade sail canopy for backyard, patio, garden, deck, pergola with UV protection and cooling shade, customizable
Item Weight	185 g
Manufacturer	SUNNY GUARD
Manufacturer Part Number	SG2CR1801
Material Type	High Density Polyethylene (HDPE)
Model Name	Shade Sail
Model Number	SGSS2C0R018-01
Mount Type	Post Mount
Number of Items	1
Number of Packs	1
Occasion Type	Wedding
Other Special Features of the Product	Patio, Lawn,Garden,Outdoor,Quick installation,UV-Blocking, Customizable size
Product Style	Safety
Size	1 0' x 1 3'
UPC	745560543061
Unit Count	127.79 Square Feet
Water Resistance Level	Not Water Resistant

SUNNY GUARD 10' x 13' Rectangle Shade Sail 95% UV Block Outdoor Canopy

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