The answers on pages 74, 75, 76 and 77 of the first volume of the fifth grade math workbook.
Page 74 category label 1( 1) rectangle+triangle (2) parallelogram-triangle (3) rectangle+rectangle 2( 1)S length =ab=40×20=800cm? S△=ah÷2=40×8÷2= 160cm？ S=800+ 160=960cm？ (2)S flat =ah= 14×7=98cm? S ladder = (a+b) × h ÷ 2 = (8+14) × 6 ÷ 2 = 66 cm? S=98+66= 164cm？