Geometry Flashcards
1
Q
Acute triangle
A
A triangle with all angles less than 90 degrees
2
Q
Obtuse Triangle
A
One angle is more than 90 degrees
3
Q
Right-angled Triangle
A
One of its angles is a right angle (90 degrees)
4
Q
Isosceles Triangle
A
Two sides of equal length
5
Q
Equilateral Triangle
A
All sides are the same length and have the same angles with all being 60 degrees.
6
Q
Scalene Triangles
A
All sides and angles are not equal.
7
Q
Convex
A
- All vertexes are outwards
- All angles are less than 180 degrees.
8
Q
Non-Convex
A
- One of its interior angles is greater than 180°
- Has a vertex facing inwards.
9
Q
Square
A
- All angles equal 90 degrees
- All sides are the same length
10
Q
Rectangle
A
- Opposite sides are parallel
- All opposite sides are equal
- All angles equal
11
Q
Rhombus
A
- All sides are equal
- Opposite angles are equal
- Angles bisect at 90 degrees
12
Q
Trapezium
A
- Can have one pair of equal sides
- One pair of parallel lines
- Two pairs of equal angles
13
Q
Parallelogram
A
- Opposite sides are equal
- Opposite sides are parallel
- Opposite angles are equal
14
Q
Kite
A
- Adjacent sides are equal
- One opposing pair of equal angles
- Diagonals meet at 90 degrees
15
Q
Sum of Quadrilaterals
A
= 360 degrees
