the composition of blue, red and yellow

Probability Level 1

The area of the total square is 15, the blue square's area is 4, please calculate the area of red square.

19-4√5 19-3√5 18-4√5 18-3√5

Larau Fu by larau fu , 20, China

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2 solutions

M S
Feb 5, 2015

Shouldn't the correct answer actually be 19-4[sqrt]15?

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Larau Fu
Feb 4, 2015

the area of the total square is 15, suits length is √15, the side length of the blue square is 2, v15-2 is the length of the red square. (√15-2)^2=19-4√5

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