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Diagonal of a rectangle divides it in two right triangles. Hence by Pythagaras theorem, the 2nd side=square root of (25-16)=3 cm. Area= 3×4 =12cm^2.
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Altitude=5*5-4*4                                                                                                             =25-16                                                                                                               =9                                                                                                                  so square root of 9 is 3....                                                                                  therefore the area  of rectangle is l*b                                                                     l=5...b=3....therefore,                                                                                          area=5*3=15 
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