Lines, Angles, And Shapes - Chapter 3 Flashcards

1
Q

What does perpendicular mean

A

When two lines meet at right angles they are perpendicular to each other

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2
Q

What is an acute angle

A

An angle which is smaller than 90° but bigger than 0°

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3
Q

What is an obtuse angle

A

An angle which is bigger than 90° but smaller than 180°

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4
Q

What is a reflex angle

A

An angle which is bigger than 180° but smaller than 360°

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5
Q

What is a revolution

A

It is a complete turn, an angle of exactly 360°

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6
Q

What are complementary angles

A

When the sum of two angles is 90° those two angles are complementary angles

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7
Q

What are supplementary angles

A

When the sum of two angles is 180° those two angles are supplementary angles

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8
Q

What are angles round a point

A

The sum of the angles at a point is 360°

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9
Q

What are vertically opposite angles

A

When two lines intersect they create two pairs of vertically opposite angles, vertically opposite angles are equal, looks like X

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10
Q

What are corresponding angles

A

When two parallel lines are cut by a transversal four pairs of corresponding angles are formed. Corresponding angles are equal and are found in a F shape lane inside parts)

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11
Q

What are alternate angles

A

When two parallel lines are cut a by A transversal two pairs of alternate angles are formed. Alters ate angles are equal they are found in a Z shape (the inside parts)

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12
Q

What are co-interior angles

A

When two parallel lines ave cut by a transversal two pairs of co-interior angles are formed. Co-interior angles are supplementary, meaning they add to 180°, they are found in a C shape

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13
Q

Parallelogram

A
  • Opposite sides are equal & parallel
  • opposite angles are equal
  • looks like a pushed rectangle
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14
Q

Rectangle

A
  • Opposite angles are equal & parallel
  • all angles are 90°
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15
Q

Square

A
  • All sides are equal
  • all angles are 90°
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16
Q

Rhombus

A
  • All sides ave equal in length
  • opposite sides are parallel
  • looks like a pushed square
17
Q

Trapezium

A
  • One pair of parallel lines
18
Q

Kite

A
  • Two pairs of adjacent sides are equal
  • one pair of opposite angles are equal
19
Q

What is the sum of interior angles

A

I = (n-2) x 180°

20
Q

What is the sum of exterior angles

A

E= 360°

21
Q

What is circumference, radius, diameter, chord

A
  • Circumference is the length around the circle
  • radius is the length from centre of the circle to the edge
  • diameter is the length from one side of the circle to the other
  • chrock is a section of a circle