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Geometry 8 Online
OpenStudy (anonymous):

can anyone help me with this question please and thanks http://ft.trillian.im/c7a1982fa524faea3ba8497ca8c9a3cf99ab584c/6c9OOqkdf293rXZFQooQVjPIsoDzr.jpg

OpenStudy (tkhunny):

\[r^{2} + 12^{2} = (4 + r)^{2}\] It's all about Pythagoras. It's easier to solve than you think.

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