Lines, Angles, And Shapes - Chapter 3 Flashcards
What does perpendicular mean
When two lines meet at right angles they are perpendicular to each other
What is an acute angle
An angle which is smaller than 90° but bigger than 0°
What is an obtuse angle
An angle which is bigger than 90° but smaller than 180°
What is a reflex angle
An angle which is bigger than 180° but smaller than 360°
What is a revolution
It is a complete turn, an angle of exactly 360°
What are complementary angles
When the sum of two angles is 90° those two angles are complementary angles
What are supplementary angles
When the sum of two angles is 180° those two angles are supplementary angles
What are angles round a point
The sum of the angles at a point is 360°
What are vertically opposite angles
When two lines intersect they create two pairs of vertically opposite angles, vertically opposite angles are equal, looks like X
What are corresponding angles
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)
What are alternate angles
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)
What are co-interior angles
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
Parallelogram
- Opposite sides are equal & parallel
- opposite angles are equal
- looks like a pushed rectangle
Rectangle
- Opposite angles are equal & parallel
- all angles are 90°
Square
- All sides are equal
- all angles are 90°
Rhombus
- All sides ave equal in length
- opposite sides are parallel
- looks like a pushed square
Trapezium
- One pair of parallel lines
Kite
- Two pairs of adjacent sides are equal
- one pair of opposite angles are equal
What is the sum of interior angles
I = (n-2) x 180°
What is the sum of exterior angles
E= 360°
What is circumference, radius, diameter, chord
- 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
