OCR maths

• cos 0°


  1
• sin 0°


  0
• tan 0°


  0
• cos 30°


  √3/2
• sin 30°


  1/2
• tan 30°


  √3/3
• cos 45°


  √2/2
• sin 45°


  √2/2
• tan 45°


  1
• cos 60°


  1/2
• sin 60°


  √3/2
• tan 60°


  √3
• cos 90°


  0
• sin 90°


  1
• tan 90°


  undefined
• if a line containing the center of a circle is perpendicular to a chord

  then, it bisects the chord
• the perpendicular bisector of a chord contains


  the center of the circle
• if a line is tangent to a circle


  then it is perpendicular to the radius at the point of tangency
• two tangent segments from the same exterior point are

  congruent and form congruent angles with the line containing the exterior point and the center
• size of the angle at the circumference is

  1/2 of the central angle
• an angle inscribed in a semicircle is

  a right angle
• angles that intercept the same arc are

  congruent
• if a quadrilateral is inscribed in a circle, then

  the opposite angles are supplementary
• the chord that is closer to the center is

  the longer chord
• the length of the diameter is greater than


  the measure of any other chord (not a diameter)
• the angle between the tangent and the chord is equal to


  the angle in the alternate segment
• Difference of two squares


  a² - b² = (a + b)(a - b)
• The Quadratic Formula


  https://o.quizlet.com/5Fl5QbB6PH9.35nNJbRCug_m.jpg
• Gradient of a line

  change in y ÷ change in x
• Equation of a straight line

  y = mx + c
• Equation of a circle with centre (0,0)

  x² + y² = r²
• Compound interest


  https://o.quizlet.com/i/VbB78yxKhBHlXrM5dEvyFA_m.jpg
• Speed, Distance and Time


  speed = distance ÷ time
• Density, Mass and Volume

  density = mass ÷ volume
• Pressure, Force and Area

  pressure = force ÷ area
• Sum of Exterior Angles =

  360°
• Sum of Interior Angles =


  (n - 2) × 180
• Exterior Angle =


  360° ÷ n
• Interior Angle =


  180° - exterior angle
• Area of a triangle


  ½ × b × h