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Math IGCSE > Angles and Lines > Flashcards

Angles and Lines Flashcards

Stuff on how to construct a triangle, parallel lines and more...

1
Q

What do all of the angles of a line add up to?

A

180

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2
Q

What do all the angles around a point add up to?

A

360

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3
Q

What is the rule with vertically oposite angles?

A

They are the same.

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4
Q

How do corresponding angles look and what is its rule?

A
The angles are the same
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5
Q

How do alternating angles look and what is the rule?

A
The angles are the same
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6
Q

How do CO-interior angles look and what is its rule?

A
Both angles add up to 180 degrees
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7
Q

What are the two properties of triangles?

A
  1. The angles = 180 degrees
  2. The exterior angle is the same as the two oposite interior angles.
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8
Q

What is the order of rotational symmetry and lines of symmetry of a rectangle?

A
  • 2 lines of symmetry
  • Rotational symmetry of 2
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9
Q

What is the order of rotational symmetry and lines of symmetry of a square?

A
  • 4 lines of symmetry
  • Rotational symmetry of 4
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10
Q

What is the order of rotational symmetry and lines of symmetry of a parallelogram and how does one look?

A
* Rotational symmetry 2 * No lines of symmetry
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11
Q

What is the order of rotational symmetry and lines of symmetry of a kite?

A
  • One line of symmetry
  • No rotational symmetry
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12
Q

What is the order of rotational symmetry and lines of symmetry of a rhombus and how does it look?

A
* 2 sides of rotational symmetry * 2 lines of symmetry Note: a tilted square
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13
Q

What is the order of rotational symmetry and lines of symmetry of a trapezium and how does it look?

A
* No lines of symmetry. * No rotational symmetry.
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14
Q

What is the defenition of a regular polygon?

A

A regular polygon is a shape with 3 or more equal sides.

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15
Q

How do you find the sum of the sum of the interior angles in a polygon?

A

I = (n - 2) x 180
n = #sides
I = sum of all interior angles

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16
Q

What is the sum of all exterior angles?

A

180n - I (sum of inetrior angles)

17
Q

What are the two equations for exterior angles?

A

E = 180n - I
I + E = 180n

18
Q

What are the 3 rules for bearings?

A
  1. Always measure the angle starting from north
  2. Always measure angle clockwise
  3. Always write bearings using 3 digits
19
Q

What is the equation of pythagoras?

A

C^2 = a^2 + b^2

20
Q

What is the relationship between the enlargment and area of enlargment?

A

n = n^2

21
Q

What is the relationship between the enlargment and volume of enlargment?

A

n = n^3

22
Q

What are the cherectaristics of an isosceles triangle

A

2 sides are the same length

23
Q

What are the charectaristics of scalene triangles?

A

A triangle whose all 3 sides have different lengths, and all three angles are of different measures.

Math IGCSE (2 decks)

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