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Grade 9 Maths > Geometry > Flashcards

Geometry Flashcards

1
Q

What are the 4 types of angles?

A

Acute angle
Right angle
Obtuse angle
Reflex angle

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2
Q

What does a straight angle =

A

180 degrees

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3
Q

What does an angle around a point =

A

360 degrees

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4
Q

What angles can you use with parallel lines? (3)

A

Corresponding angles
Alternate angles
Interior angles

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5
Q

What’re the types of triangles? (4)

A

Equilateral
Isosceles
Scalene
Right angle

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6
Q

How does the theorem of Pythagoras work?

A

Two short sides (a and b) adjacent to the right angle, and the longest side (c) (hypotenuse).
A squared + B squared = C squared

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7
Q

What are the combinations to prove congruent triangles? (4)

A

SSS
SAS
RHS
AAS

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8
Q

How can you prove triangles are similar?

A

SSS
Sides in proportion

AAA
All 3 corresponding angles are equal

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9
Q

What are the properties of sides and angles of a parallelogram?

A

Both pairs opposite sides parallel
Both pairs opposite sides equal
Both pairs opposite angles equal

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10
Q

What are the properties of sides and angles of a rectangle?

A

Both pairs opposite sides parallel
Both pairs opposite sides equal
All angels equal 90 degrees

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11
Q

What are the properties of sides and angles of a rhombus?

A

Both pairs opposite sides parallel
All sides equal
Both pairs opposite angles equal

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12
Q

What are the properties of the diagonals of a parallelogram?

A

Diagonals bisect each other.

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13
Q

What are the properties of the diagonals of a rectangle?

A

Equal diagonals
Diagonals bisect each other

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14
Q

What are the properties of the diagonals of a rhombus?

A

Diagonals bisect each other perpendicularly (at 90 degrees)
Diagonals bisect the corner angles.

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15
Q

What are the properties of the diagonals of a square?

A

Equal diagonals
Diagonals bisect each other perpendicularly
Diagonals bisect the corner angles into 45 degree angles.

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16
Q

What are the properties of the diagonals of a isosceles trapezium?

A

Equal diagonals
Two isosceles triangles

17
Q

What are the properties of the diagonals of a kite?

A

One diagonal bisects the other perpendicularly.
One diagonal is a symmetry line.
The symmetry line bisects the corner angles.

18
Q

What are the properties of the sides and angles of a square?

A

Both pairs opposite sides parallel
All sides equal
All annals equal 90 degrees

19
Q

What are the properties of the sides and angles of a trapezium?

A

One pair opposite sides parallel
Isosceles trapezium has non-parallel sides equal.

20
Q

What are the properties of the sides and angles of a kite?

A

Two pairs adjacent sides equal.
Equal angles opposite symmetry line.

Grade 9 Maths (2 decks)

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