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(20點) F.2 Maths Question (Pythagors' Theorem)

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Please help me to answer the following question. http://img133.imagevenue.com/img.php?image=52509_bbb_122_400lo.jpg Step by Step please !!!

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7 (a) h = √(17^2-8^2) = √(289-64) = √225 =15 (b) the area of triangle ABC =16*15/2 =120 cm^2 8 Since 17^2=8^2+15^2 BC^2=AB^2+AC^2 So triangle ABC is a right-angled triangle angle A is a right angle the area of triangle ABC =8*15/2 =60 cm^2 9 (a) p=√(12^2+4^2) = √(144+16) = √160 =12.6 (correct to 3 significant figures) q=√(p^2+3^2) = √(160+9) = √169 =13 10 (a) x =√10^2+6^2) = √(100+36) = √136 =11.7 (correct to 3 significant figures) y =√x^2-8^2) = √(136-64) = √72 =8.49 (correct to 3 significant figures)

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