Unit 1

Question 1

Perpendicular bisector

Answer 1

Mid pt =(X1+ X2/2 ,Y1+Y2/2)

Gradient = Y2-Y1/X2-X1 ( use point just worked out)
FLIP REVERSE

Y-b=m(x-a) ( use point just worked out)

Question 2

Altitudes

Answer 2

Gradient = m=Y2-Y1/X2-X1
Flip reverse

OTHER POINT (top)

Y-b=m(x-a)

Question 3

Medians

Answer 3

Mid pt= (X1+X2/2,Y1+Y2/2)

Gradient =Y2-Y1/X2-X1
(Use point just worked out)

Y-b=m(x-a)

Question 4

Exact values :

Sin

Answer 4

0*= 0
30*=1/2
45*=1/square root of 2 
60*=square root of 3/2
90*=1

Question 5

Exact values:

Cos

Answer 5

0*=1
30*=square root of 3/2
45*=1/square root of 2
60*=1/2
90*=0

Question 6

Exact values :

Tan

Answer 6

0*=0
30*=1/square root of 3
45*=1
60*=square root of 3
90*= nor defined