book Maths Puzzle Numerical Ability

What is the circumference of a circle with a diameter of 30 centimeters?
a)188.4 cm
b) 47.1 cm
c) 94.2 cm
d) 9.55 cm

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book Other Question

Is there a formula to find the height(h) of a section of a chord ,knowing the full chord length (c), the sections length (l) and the radius of the arc(r)?

Say (c)=914.4mm, (l)= THE SECTION IS CALLED TWO VARIABLE INQUALITEIS

I WANT TO KNOW
HOW WOULD YOU GRAPH

Y=[4X+2]