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Class Test 2, Screenshot 2025-07-30 at 11.20.00 AM, Screenshot 2025-07-30…
Class Test 2
Rate & Proportion
Rate & speed
Distance = Area under graph
Acceleration = Speed/Time
Direct Inverse
Inverse; y=k/x
Direct; y=k*x
Maps & scales
Linear scales; (1 : n)
Length
Area = A1 / A2 = (ℓ1 / ℓ2)
Trigonometry
Pythagoras
a^2 + b^2 = c^2
Trigonometric Ratios
Sin
Cos
Tan
Inverse
Sin^-1
Cos^-1
Tan^-1
*converse
If c^2 = a^2 + b2, then triangle
has a right angle
Angle of elevation & depression
Angle of elevation & depression are equal
3d Trigonometry
Algebra
Factorise
(a + b)^2 = a^2 + 2ab + b^2
(a - b)^2 = a^2 - 2ab + b^2
a^2 + b^2 = (a - b)(a + b)
ab + ac = a(b_c)
ab + ac + db + dc (a + b)(d + c)
Quadratic
more empty space idk
