Properties of triangles, quadrilaterals and angles Flashcards
True or false: trapeziums has three right angles and two parallel sides
False (a most common trapezium has no right angles and one parallel side)
What is an equilateral triangle?
A triangle in which all the lines and angles are of the same size/ length
What is an isosceles triangle?
A triangle in which two lines and angles are equal
What is a right angled triangle?
A triangle containing one right angle
What is a scalene triangle?
A triangle which contains three different length lines and three different sized angles
What is a parallelogram?
A quadrilateral with the opposite lines parallel and opposite angles equal
What is a rhombus?
A quadrilateral in which all four lines are equal, opposite lines are parallel and opposite angles are of the same size
What is a kite?
A quadrilateral where the adjacent sides (the sides that touch) are of equal length
True or false: all squares are rectangles
True (squares are a special type of rectangles)
True or false: no squares are also rhombuses (give an explanation as to why or why not)
False. The definition of a rhombus is all sides are equal, and opposite angles are the same size- this is applicable to squares too
True or false: all squares are parallelograms (give an explanation as to why or why not)
True. The definition of a parallelogram is opposite sides are parallel and opposite angles are equal- this is also applicable to squares
Angles on a straight line add to ____ degrees
180
Angles around a point add to ______ degrees
360
Angles in a quadrilateral add to ______ degrees
360
Angles in a triangle add to ______ degrees
180
A right angle is ____ degrees
90
Any angle below 90 degrees is an ______ angle
Acute
Any angle between 91 degrees and 179 degrees in an _______ angle
Obtuse
Any angle between 181 degrees and 359 degrees is a ______ angle
Reflex
What is a rectangle?
A quadrilateral in which opposite sides are equal and parallel, and all four angles are equal and right angles
What is a square?
A quadrilateral in which all sides are equal, opposite sides are parallel and all angles are equal and are right angles. Squares are a special type of rectangles.
