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Bunuel
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pythagoras theorem is explained in school books using the same figure as being given in the question
for square with area 25 side = 5
for square with area 144 side = 12
area of triangle T = 1/2 * base * height
= 1/2 * 5 *12
= 30 sq units
correct answer option B
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Side of Each Square can be found out by taking the square root of the respective areas

Side of Square X = \sqrt{25} =5
Side of Square Y = \sqrt{144} =12
Side of Square Z = \sqrt{169} =13

But we are asked the area of the triangle formed by these sides
= 1/2 x base x height
= 1/2 x 5 x 12
= 30

Answer : B
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[Information regarding square Z seems to be distractive; not required in computation[/quote]

Not true, z needs to establish that triangle is right.
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