which weighed 30 pounds. Find the percentage of thescrap.PROPORTIONProportion is a statement of two ratios which areequal.Example:1/3=5/15 or 1:3=5:15SOLVING PROPORTIONSGiven the proportion:by cross multiplying: a x d = b x cExample:If 50 sheets of galvanized iron weigh 2,313 pounds, howmuch will 39 sheets weigh?Let W = weight of 39 sheetsCROSS MULTIPLYTHE LAW OF PYTHAGORASThe Law of Pythagoras is the square of the hy-potenuse of a right triangle equals the sum of thesquares of the two legs. It is expressed by the formulaa^{2 }+ b^{2 }= c^{2}.1.2.3.RIGHT TRIANGLE— triangle having oneright angle.HYPOTENUSE— The hypotenuse of a righttriangle is the side opposite the right angle.LEG— The leg of a right triangle is a sideopposite an acute angle of a right triangle.A ABC is a right triangle.L C is a right angle.c is side opposite L C and is the hypotenuse.a is side opposite L A and is a leg.b is side opposite L B and is a leg.According to the Law of Pythagoras:a^{2} + b^{2} = c^{2}or by subtracting b^{2 }from both sidesa^{2}= c^{2}– b^{2}or by subtracting a^{2 }from both sidesb^{2} = c^{2} – a^{2}Example:AII-22

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