1) Angles at the centre of a circle add up to a) 180 degrees b) 360 degrees c) 540 degrees 2) A radius of a circle is 8 cm. What is its diameter? a) 4 cm b) 10 cm c) 16 cm 3) A line of symmetry in a circle is a a) diameter b) radius c) circumference 4) Circles are congruent if their diameters are  a) different lengths b) the same length c) long 5) The perimeter of a circle is also known as its a) circumference b) radius c) diameter 6) A diameter of a circle is 25 cm. What is its radius? a) 12 cm b) 12.5 cm c) 50 cm 7) The longest chord of a circle is called its a) radius b) diameter c) circumference 8) Which word best describes a circle? a) plane shape b) solid shape c) polygon 9) Each angle in the circle shown measures a) 30 degrees b) 60 degrees c) 90 degrees 10) How many lines of symmetry are there in a circle? a) 2 b) 4 c) infinite

Circle

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