THE FORMULAS

Question 1

Cosine rule

Answer 1

a2=b2+c2-2bccosA

Question 2

Area of a triangle

Answer 2

1/2absinC

Question 3

The mid- point

Answer 3

(x1+x2 y1+y2)
——- , ——–
2 2

Question 4

Equation of the centre of a circle

Answer 4

(x-a)2+(y-b)2=r2

Question 5

The nth term

Answer 5

ar^n-1

Question 6

Differentiation

Answer 6

nx^n-1

Question 7

Integration

Answer 7

x^n+1/n+1

Question 8

Radians to degrees

Answer 8

vita x 180/pi

Question 9

Degrees to radians

Answer 9

vita x pi/180

Question 10

Arc length

Answer 10

r x vita

Question 11

Circumference

Answer 11

vita/180 x pi x r

Question 12

Area of a sector

Answer 12

1/2 r2 x vita

Question 13

The formula for solving Quadratic equations

Answer 13

x= -b(+or-) sqr(b^2 -4ac)/2a

Question 14

Gradient of a line

Answer 14

y2-y1/x2-x1

Question 15

Equation of line passing through 1 point with gradient m.

Answer 15

y-y1=m(x-x1)

Question 16

THE FIVE FORMULAS FOR SOLVING PROBLEMS ON ACCELERATING PARTICLES.

Answer 16

v=u+at
v2=u2+2as
s=(v+u)/2)t
s=ut+1/2at2
s=vt-1/2at2

Question 17

Area of a trapezium

Answer 17

1/2(a+b)h

Question 18

The impulse of a force

Answer 18

I=Ft

Question 19

The impulse momentum principle

Answer 19

I=mv-mu

Question 20

Principle of convention of momentum

Answer 20

m1u1+m2u2=m1v1+m2v2