 | David Rayner - Mathematics - 2000 - 500 pages
...the sum of the angles p, q and r. (b) Write down the sum of the angles q and x. (c) Hence show that the exterior angle of a triangle is equal to the sum of the interior angles at the other two vertices. 24. The diagram shows two equal squares joined to a... | |
 | David Baker - Mathematics - 2000 - 662 pages
...properties of parallelograms and a proof that the angle sum of a triangle is 180°; understand a proof that the exterior angle of a triangle is equal to the sum of the interior angles at the other two vertices; l(d) use angle properties of equilateral, isosceles... | |
 | Linda Bostock - Juvenile Nonfiction - 2001 - 454 pages
...also lead to another useful tact about angles in triangles: (2) and (3) => f°+g° = q° + r° ie an exterior angle of a triangle is equal to the sum of the two interior opposite angles. Because this proof does not involve measuring angles in a particular triangle it applies to all possible... | |
 | J. Compton, Allyn Jones - Juvenile Nonfiction - 2000 - 294 pages
...+ b + с + d + e = 360 d° e 2. Triangles (a) Angle sum of a triangle is 180°. a + b + c= 180 (b) The exterior angle of a triangle is equal to the sum of the opposite interior angles. A С D (c) In an isosceles triangle the base angles are equal. Given... | |
 | John Casson, Keith Pledger - Juvenile Nonfiction - 2001 - 682 pages
...equilateral isosceles right-angled scalene Interior angles of a triangle add up to 180°. a+h + c= 180° 7 The exterior angle of a triangle is equal to the sum of the interior opposite angles. 8 A polygon with four sides is called a quadrilateral. A quadrilateral... | |
 | Karen Hughes - Juvenile Nonfiction - 2001 - 132 pages
...corresponding angles • Angles on a straight line add up to 180°. Angles in a triangle add up to 180°. The exterior angle of a triangle is equal to the sum of the interior angles at the other two vertices. Vertically opposite angles are equal. Base angles of... | |
 | Alex Greer, Clarrie Layne - Juvenile Nonfiction - 2001 - 498 pages
...Fig. 29.9 Since the three angles of a triangle add up to 180°, x + 42 + 68 = 180 x = 180-42-68 = 70 The exterior angle of a triangle is equal to the sum of the opposite interior angles. Hence: y = 42 + 68 = 110 Therefore the angle j is 110°. Exercise 141... | |
 | David Baker - Mathematics - 2001 - 546 pages
...parallelograms and a proof that the angle sum of a triangle is 180 degrees; understand a proof that the exterior angle of a triangle is equal to the sum of the interior angles at the other two vertices 2(d) Use angle properties of equilateral, isosceles and... | |
 | D. Duffield - Mathematics - 2001 - 196 pages
...of the interior angles of a triangle is equal to 180°. [Abbreviation: < sum of _] X + Y + Z = 180° The exterior angle of a triangle is equal to the sum of the opposite interior angles. [Abbreviation: ext. < of ¿1] C, = A + B ie C, = * + Note: An exterior... | |
 | M. J. Tipler - Mathematics - 2003 - 340 pages
...understand a proof that: - the sum of the angles of a triangle is 180* and of a quadrilateral is 360° - the exterior angle of a triangle is equal to the sum of the two interior opposite anglesChapter 1 1 Lines and Angles Parallel and perpendicular lines page 287 Angles page 29 1 Angles... | |
| |
To prove that the exterior angle of a triangle is equal to the sum of the two interior opposite angles (see fig. 
