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# AS Level differentiation question watch

1. 'Triangle ABC has a right angle at C. The shape of the triangle can vary but the sides BC and CA have a fixed total length of 10cm. Find the maximum area of the triangle' Could someone help me discern the correct equation to use?
2. Area of the triangle = 1/2 AC x BC = y
AC = 10-BC
BC = x
AC = 10 - x
y= 1/2 x (x)(10 - x)
y = 5x -(x^2/2)
Then differentiate 😊
3. Thanks!

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Updated: February 27, 2016
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