What is the length of the 4th side? [closed]

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Given the figure in this image (I don't know the correct name in English. I wish to know the length of the 4th side. How to calculate it and what's the length of the 4th side?

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2 Answers

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You can use the rule of Pythagoras: $$a^2+b^2=c^2$$

while the line $a$ is prependicular to $b$

In your case you get: $$?=\sqrt{(310 \text{cm})^2+(300\text{cm}-204\text{cm})^2}=\sqrt{105 315} \text{cm} \approx 325 \text{cm}$$

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Hint: draw this line...............

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