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G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

Order a 12-month Year 7 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 8 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 9 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 10 Interactive Maths software Homework Licence for only $19.95.

Year 9 Interactive Maths - Second Edition


Area of a Circle

A circle with radius r units has an area of A square units given by the formula

where 


Example 17

Find the area of a circle whose diameter is 28 m.

Solution:



Example 18

Find the area of a circle whose diameter is 19 cm.

Solution:

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