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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


Problem Solving Unit

Problem 15.1  Coins
You are given one coin with a diameter of 7 cm and a large supply of coins each with a diameter of 3 cm.

b.  What is the maximum number of smaller coins that may be arranged tangentially around the
     larger coin without any overlap?


Problem 15.2  Inscribed Triangle

A triangle is inscribed in a circle such that one side of the triangle is a diameter of the circle.  If one of the acute angles of the triangle has measure 40º and the side adjacent to that angle has length 9 cm, find the radius of the circle.

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