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Question 1

Radians equations you need to know

Answer 1

arc length s = r*(theta) (must remember)

Area of sector = 0.5r^2theta (most useful so try remembering but can work without)

P of sector = r*theta + 2r (can prob work without )

Area of segment = 0.5r^2theta (sector) - 0.5r^2 sin theta (triangle) (can prob work without)

the two triangle formulas + pier^2 + rtheta are enough really

Question 2

When writing an expression for an arithmetic equation going down how should you write it

Answer 2

Cn = -(d)Cn+(how much for d to get to a)

Question 3

for connected rates what should you remember to cancel derivatives

Answer 3

If you are given the rate of decrease of surface area of a cube so like
da/dt = 6x^2 cms^-1

and you want dv/ dt you can cancel by putting area and volume expressions together so

da/dt * dv/da = dv/dt. so you can divide the two expressions by each other to cancel da out