= (a + b)h x6 =²/²(x + y)b c (a + d (a + b)y e ay + xb 1 22 The surface area of a cylinder is 31 cm². surface area of a similar cylinder three tin as high is b 62 cm² 2 e 279 cm² c 93 2 34 cm² a d 124 cm² O The scale of a model aeroplane is 1: 20 area of the wings on the model is 600 c
