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: 563050125-2 2 Lets Learn 241208 3 , . 8 1 9 15 16 23 - - - ConceptConceptConcept ? ? 1 ABC ACB ( 90o) AB AC BC ^ ___ ___ ___ 2 : ? ? 3 ? (1) (2) ABC MNO ? 4 ABC ACB c AB a BC b AC c2=a2+ b2 ___ ___ ___ ^ 5 6 1 c c2 = 82+152 = 64 + 225 = 289 = 17x17 c = 17 17 ? 7 2 a 242 = 252+a2 a2 = 252-242 = 625-576 = 49 = 7x7 a = 7 7 8 ? 3,000 . . . 9 ABC ACB BC 3 , AC 4 AB 5 ABIH, BCED ACGF AB , BC AC ABIH 52 = 25 BCED 32 = 9 ACGF 42 = 16 25 = 9+16 ABIH BCED ACGF 10 ? .. 11 ? 1 20 12 x 202= 122 + x2 x2 = 202-122 = 400 144 = 256 = 17x17 x = 17 17 12 2 ABCDEFGH AF 8 AB 12 BC 9 FC ___ AFC FAC FC2 = AF2 + AC2(1) AC2 ABC ABC ABC AC2 = AB2 + BC2..(2) (2) (1) ; FC2 = AF2 + (AB2 + BC2) = 82+ (122+92) = 64 + 144 +81 = 289 = 17 x 17 FC = 17 FC 17 17 ^ ___ ^ 13 3 6 400 306 B A C AP PQ = AB PQ BC Q AB = PQ = 400 BC = 306 AP = BQ = 6 CQ = 306-6 = 300 PQC PQC PC2 = PQ2 + CQ2 = 4002 + 3002 = 160,000 + 90,000 = 250,000 = 500 X 500 PC = 500 500 500 ^ 14 ... ... Finish 15 ... !! 16 .. ? ... !!?? :) Write it down 13 1 3, 4 5 5 ... ?... 17 ABC a, b c c2 = a2 +b2 ABC 18 ABC AB = c , BC = a , AC = b c2 = a2 +b2 ABC ACB DEF EF DF a b DFE ^ 19 ^ EF = BC = a DF = AC = b () DEF DE2 = a2 + b2 () ABC c2 = a2 + b2 ( ) DE2= c2 () DE = c DEF ABC (--) DFE = ACB = 90o ( ) ABC ACB ^ ^ ^ 20 ABC ABC ? 21 ? - 22 ...? 6.5 2.5 1. 2. 6 1,800 2.4 23 . (2553). . : . .