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P1,area of triangular sails

10) A windmill has four identical triangular sails made from wood. If each triangle
has sides of length 12 m, 15 m and 20 m, work out the total area of wood needed.

My answer is 360 but the book says it is 359. Why is it 359 ? Thank you!
Original post by Nancy2000
10) A windmill has four identical triangular sails made from wood. If each triangle
has sides of length 12 m, 15 m and 20 m, work out the total area of wood needed.

My answer is 360 but the book says it is 359. Why is it 359 ? Thank you!

The answer is 359 (rounded), so if youve got something else it would help to see what you did.
Based on your posting in other thread, the triangle is not right angled.

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