6 Two circles have circumferences of 10 cm
and 12 cm. What is the difference in their
radii?
7 A chord of a circle subtends an angle of 60°
at the centre of a circle of radius 7 cm. Find
the perimeter of the minor segment of the
circle.
8 A piece of thread was wound tightly round a
cylinder for 20 complete turns. The thread
was found to be 3.96 m long. Calculate the
diameter of the cylinder in cm.
9 Calculate the perimeter of a sector of a circle
of radius 27 cm, the angle of the sector being
140°.

ummm seems that u didnt post the attachement !

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.

really your just stupid if you don't know this

step-by-step explanation: