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Angles revision (Types of angles (Right angles are 90º, Acute angles are…
Angles revision
Types of angles
Right angles are 90º
Acute angles are angles less than 90º
Obtuse angles are angles between 90º and 180º
Reflex angles are angles larger than 270º
Vertically opposite angles are equal
Angles in shapes
Angles on a straight line add up to 180º
Angles on a point add up 360º
Angles in a triangle add up to 180º
Angles in a quadrilateral add up to 360º
Angles in special triangles
In an equilateral triangle, all the angles are 60º
In an right angle triangle, there is an angle that is at 90º
In an isosceles triangle the bottom 2 angles are equal
In a scalene triangle all the angles are different
Angles in special quadrilaterals
In a parallelogram, 2 pairs of angles are equal
In a square and a rectangle all the angles are 90º
Angles on parallel lines
Alternate angles are equal and make a "Z" shape
Supplementary angles add up to 180º and make a "U" shape,
Corresponding angles are equal and make an "F" shape