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O580/21/M/j/11 QUESTION13,question 16 part (a),18PART(B)
q13) a) 1 : 20000
0.000027: x
b) 1 :20000square
x : 644000000
q16) a) the shaded area is A
and A =’s the area of the square minus area of the circle
area of the square is k square
the area of the circle is π(k/2)whole square ….where k/2 is the radius of the circle
now you can make the equation
q18) b) MX = MR + RX
r/2 + 3/4 q – r
Simplify it further and you'll get the ans