http://www.stampcollectioninfo.com/vertical-pair/
what is a linear pair of angles?
also what is a pair of vertical angles?
thanks!
Linear angles are two adjacent angles at the the intersection of two straight lines. Linear angles add up to 180 degrees (i.e., are supplementary angles). See first source.
Vertical angles are two angles opposite to one another at the intersection of two straight lines. Vertical angles are equal to one another (are congruent). See second source.
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 Mint never Hinged C91 C92 w Plate Number block and possible 2 vertical pairs $1.99 Time Remaining: 2h 15m Buy It Now for only: $2.50 |
 United States Sc 1338k MNH Vertical Strip of 3 With Vertical Pair Imperforate $147.99 Time Remaining: 2h 42m |
 United States Sc 755 MNH Imperforate Vertical Line Pair NGAI Extra Fine $1.29 (1 Bid) Time Remaining: 2h 47m |
 ALASKA 1949 uprated 10c Aerogramme + Prexie Vertical Coil Line Pairs $9.99 Time Remaining: 3h 8m Buy It Now for only: $12.50 |
 US 1912 Scott 411 Vertical Pair Used $17.00 Time Remaining: 5h 34m |
 SCOTT 756 765 1935 NATIONAL PARKS VERTICAL LINE PAIRS CS NGAI VF CAT 37 $27.50 Time Remaining: 7h 7m Buy It Now for only: $27.50 |
 3855 56 LEWIS CLARK VERTICAL PAIR MINT NH $2.85 Time Remaining: 8h 24m Buy It Now for only: $2.85 |
 US Stamp L45 Scott 753 Mint NH VERTICAL LINE PAIR Large Margin VF Centering $14.94 (1 Bid) Time Remaining: 9h 32m |
 US 1901 PAN AMERICAN EXPOSITION SCOTT 299 SHIP VERTICAL PAIR USED $15.00 Time Remaining: 9h 50m Buy It Now for only: $25.00 |
 USA 1937 ARMY JACKSON SCOTT 786 FDC VERTICAL PAIR $4.46 Time Remaining: 11h 47m Buy It Now for only: $4.46 |
 488 Washington 2c Rotary Perf 10 Vertical Pair Mint Never Hinged Sound $4.99 Time Remaining: 12h 22m |
 843 VERY RARE PRETTY MNH 4c MADISON VERTICAL COIL PAIR $6.99 Time Remaining: 12h 37m Buy It Now for only: $7.75 |
 489 Washington 3c Rotary Perf 10 Vertical Joint Line Pair Mint Never Hinged $24.99 Time Remaining: 13h 10m |
 807 3c Prexie Pair++ With Full Vertical Gutter MNH $139.99 Time Remaining: 13h 14m Buy It Now for only: $139.99 |
 US Sc 9 Type IV Vertical Pair faults $35.00 Time Remaining: 13h 15m |
 347 Washington 5c Imperf Vertical Pair Very Fine Used $75.00 Time Remaining: 13h 58m |
 1935 Sc 766 Farley imperf Ft Dearborn vertical gutter pair $5.20 Time Remaining: 14h 43m Buy It Now for only: $5.20 |
 1935 BYRD EXPEDITION Sc 768 imperf FARLEY vertical gutter pair $8.65 Time Remaining: 16h 35m Buy It Now for only: $8.65 |
 US REVENUE STAMP SCOTT R155 2 CENT WASHINGTON VERTICAL PAIR $2.05 Time Remaining: 17h 1m |
 1934 Sc 769a Farley Parks MINT vertical gutter pair $7.00 Time Remaining: 17h 29m Buy It Now for only: $7.00 |
 United States C91 2 C93 4 C95 6 Mint NH Aviators Set of 6 3 Vertical Pairs $3.98 Time Remaining: 1d 4h 33m Buy It Now for only: $3.98 |
 1935 Sc 752 Newburgh Farley issue vertical gutter pair $8.65 Time Remaining: 1d 6h 50m Buy It Now for only: $8.65 |
 USA 1955 Scott Cat 1052 MNH Vertical Pair $7.00 Time Remaining: 1d 7h 5m |
 481 VERTICAL LINE PAIR 1916 1 CENT IMPERF ISSUE MINT OG NH $8.00 Time Remaining: 1d 10h 33m Buy It Now for only: $8.00 |
 Jan 15 1948 5c Vertical Coil Sideways Pair Art Craft $3.25 Time Remaining: 1d 11h 53m Buy It Now for only: $3.25 |
 9 VF VERTICAL PAIR WITH LIGHT CANCEL BN9632 $149.00 Time Remaining: 1d 13h 1m Buy It Now for only: $149.00 |
 9 XF APP VERTICAL PAIR MOUNTING RESIDUE ON REVERSE BN9634 $140.00 Time Remaining: 1d 13h 4m Buy It Now for only: $140.00 |
 9 USED VERTICAL PAIR TOP STAMP XF GEM BN9635 $145.00 Time Remaining: 1d 13h 4m Buy It Now for only: $145.00 |
 598 Line Pair Strip o 4 Perf 10 Vertical Rotary Coil F VF NH EFO Ink Smear $4.95 Time Remaining: 1d 14h 8m |
 496 Line Pair Perf 10 Vertical Rotary Press Coil F VF LH Pencil Mark on Gum $9.95 Time Remaining: 1d 14h 9m |
 USA 1862 71 USED SC R101 REVENUE DOCUMENTARY STAMPS VERTICAL PAIR IMPEF CAT600 $99.99 Time Remaining: 1d 17h 56m Buy It Now for only: $99.99 |
 1995 Marilyn Monroe Sc 2967 PRESS SHEET vertical gutter pair $14.50 Time Remaining: 2d 2h 48m Buy It Now for only: $14.50 |
 US Sc C61 MNH 1960 7c carmine Jet Vertical Coil Joint Line Pair $23.96 Time Remaining: 2d 5h 28m Buy It Now for only: $23.96 |
 US 994 1950 3ct Kansas City Cent VERTICAL PAIR MNH $0.98 Time Remaining: 2d 10h 44m Buy It Now for only: $0.98 |
 Scott 2869 ea Vertical Gutter Pair MNH $2.50 Time Remaining: 2d 11h 8m Buy It Now for only: $2.50 |
 Scott 2869 ok Vertical Gutter Pair MNH $2.50 Time Remaining: 2d 11h 13m Buy It Now for only: $2.50 |
 1898 R168 10c brown vertical pair used $2.00 Time Remaining: 2d 11h 17m |
 Dr Bob US Scott 753 NH NGAI VERTICAL LINE PAIR Cat 3250 $24.00 Time Remaining: 2d 12h 18m Buy It Now for only: $24.00 |
 Scott C51 vertical pair $1.00 Time Remaining: 2d 13h 18m Buy It Now for only: $1.00 |
 US USED 634a VERTICAL PAIR PRECANCEL KANSAS CITY MO $13.75 Time Remaining: 2d 14h 42m Buy It Now for only: $13.75 |
 US 1923 Scott 572 Vertical Pair and Single and 573 Single Used $10.00 Time Remaining: 3d 1h 55m Buy It Now for only: $10.00 |
 US Stamp Mint Scotts 758 pair Vertical Line $0.99 Time Remaining: 3d 2h 52m |
 Stamps Vertical Pair 2 Cents Washington 1923 WHITESVILLE NY Cancel Precancel $9.99 Time Remaining: 3d 5h 17m |
 Scotts 1338 MAJOR ERROR Vertical Pair Imperforated Between No Gum $165.00 Time Remaining: 3d 7h 24m Buy It Now for only: $165.00 |
 US 9 Used vertical pair Pos 84L1L 94L1L $194.00 Time Remaining: 3d 7h 43m Buy It Now for only: $194.00 |
 US Scott 483 Vertical Pair MNH $24.95 Time Remaining: 3d 7h 49m Buy It Now for only: $24.95 |
 2440a SCARCE IMPERFORATE VERTICAL PAIR ERROR WITH PFC $540.00 Time Remaining: 3d 8h 10m Buy It Now for only: $540.00 |
 1934 Sc 769a Farley MINT vertical gutter pair 1c Parks $7.20 Time Remaining: 3d 8h 32m Buy It Now for only: $7.20 |
 US 756 765 set NGAI vertical line pairs $32.00 Time Remaining: 3d 9h 3m Buy It Now for only: $32.00 |
 US 410 MNH Vertical line pair $27.00 Time Remaining: 3d 9h 20m Buy It Now for only: $27.00 |