maths revision

Angles

• 
• Acute
• An angle which is between 0 degrees and 90 degrees.
• Obtuse
• An angle which is more than 90 degrees and 180 degrees.
• Right angle
• An angle which is just 90 degrees.
• Straight line angle
• An angle which is just 180 degrees.
• Reflex angle
• An angle which is more than 180 degrees but less than 360 degrees.

Angles

• ALL ANGLES on a straight line add up to 180 degrees.
• ALL ANGLES at a point add up to 360 degrees.
• ALL ANGLES IN A TRIANGLE ADD UP TO 180 DEGREES.
• ISOSCELES= 2 angles are the same size and 2 sides are the same length.
• EQUILATERAL= all sides are the same length and each angle is 60 degrees.
• RIGHT ANGLE TRIANGLE= 1 angle is 90 degrees.
• SCALENE TRIANGLE = all angles and side lengths are different

PARALLEL LINES

• 
• ALTERNATIVE ANGLE
• The first picture is an alternative angle as you can see it goes in to a Z shape.
• CORROSPONDING ANGLE
• The second picture is a corresponding angle as you can see it goes in to a backwards Z.

PYTHAGORAS THEOREM

• 
• HYPOTENUSE
• The line which is opposite the 90 degree square.
• If working out the size of the line opposite the 90 degree square then square both of the other sides and then ADD both answers together. Once you have got the answer SQUARE ROOT the answer and then that should give you the FINAL ANSWER.
• IF YOU ARE WORKING OUT THE OTHER 2 SIDES THEN SUBTRACT THE ANSWERS AFTER SQUARING THEM INSTEAD OF ADDING!

SOLVING EQUATIONS

• 5x+2x+3y+y
• ADD NUMBERS TOGETHER IF THEY HAVE THE SAME LETTER!
• = 7x+4y

Folie 6