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" Since the exterior angle of a triangle is equal to the sum of the two interior opposite angles (th. "
A Course of Mathematics: In Three Volumes : Composed for the Use of the ... - Page 114
by Charles Hutton - 1811
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Key Maths GCSE: CCEA Foundation

2001 - 578 pages
...corresponding angles. c Understand a proof that the angle sum of a triangle is 180° and a proof that the exterior angle of a triangle is equal to the sum of the interior angles at the other two vertices; explain why the angle sum of any quadrilateral is 360°....
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Key Maths GCSE: CCEA Higher

2001 - 588 pages
...structured way the proof that the angle sum of a triangle is 180°. Question 6 deals with the proof that the exterior angle of a triangle is equal to the sum of the opposite interior angles. This is not structured but it is essentially the same proof and should...
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Folens Maths Programme

Susan Ball, Sue Briggs, Margaret Mackenzie - 2003 - 212 pages
...only facts that have already been proved, copy and complete the following proofs. a. B is shaded red The exterior angle of a triangle is equal to the sum of the two opposite interior angles. b. Ld = ^a + ^b (exterior angle is equal to the sum of the two opposite...
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Maths Connect

2003 - 232 pages
...on a triangle) so x = b + c The exterior angle of a triangle is made by extending one of the sides. The exterior angle of a triangle is equal to the sum of the two opposite interior angles of the triangle. Example Calculate the size of the lettered angles....
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Maths Connect 2 Blue, Volume 2, Part 2

Sue Bright, Lynne McClure - 2004 - 232 pages
...\&0° 3x + 60° = 150° 3x = 120° x = 40° and 2x = 60° The sum of angles in a triangle is 180° The exterior angle of a triangle is equal to the sum of the two interior opposite angles. d) Calculate the size of the lettered angles, giving reasons for your answers. a) b) Look at the blue...
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New Maths in Action

2002 - 108 pages
...(not the included angle) - the ambiguous case Fl 6. The exterior angles of a triangle FS4 Know that the exterior angle of a triangle is equal to the sum of the two interior opposite angles ....Q^r.... The triangle The sum of the angles of a triangle 1 Calculate the size of each unmarked...
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Connections Maths, Volume 9

Ajit Kalra, James Stamell - 2004 - 616 pages
...important rules about the angles in triangles: The sum of the interior angles of a triangle is 180°. and The exterior angle of a triangle is equal to the sum of the 2 interior opposite angles. Examples Find the size of the unknown angle in AABC. a + 55 + 30 =...
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Excel HSC Mathematics

Lyn Baker - 2001 - 316 pages
...[vertically opposite ZADC] ZDEF + 65°+48°= 180° [angle sum of atriangle] л ZDEF =67° С Exterior Angles The exterior angle of a triangle is equal to the sum of the /a° interior opposite angles. (a + b) Example: Find the value of x. (а) ч 67o (b) Solution:...
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New National Framework Mathematics 9 Core Pupil's Book, Volume 9

M. J. Tipler - 2004 - 468 pages
...interior angles of a triangle add to 180° Example m + 57° + 64° = 1 80° m = 180° -57° -64° = 59° The exterior angle of a triangle is equal to the sum of the two opposite interior angles. Example / = 47° + 58° = 105° Practice Questions 4, 5, 17, 40 Angles...
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New National Framework Mathematics 8 Core Workbook, Volume 8

Maryanne Tipler - 2004 - 150 pages
...triangles Angle x is an interior angle of the triangle. Angle v is an exterior angle ol the triangle. The exterior angle of a triangle is equal to the sum of the two opposite interior angles. „pie / = 47° + 58c = 105° Quick questions Find the value x. ab...
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