Question

Me ajudem com essas expressões do Teorema de Tales, por favor!

Answer 1

a) 8/4=10/x     multiplicando em cruz temos: 8.x = 4.10        8x = 40                                                                                                x = 40 : 8                                                                                                x = 5cm
b) modo de resolução igual:10/x = 15/12     15.x = 10 .12    15.x = 120    x = 120 : 15     x = 8cm
c) 7/6,3 = x/7,2    6,3 . x = 7.7,2    6,3.x = 50,4  x = 50,4 : 6,3     x = 8 cm
d) x/30 = 8/20    20.x = 8.30   20.x = 240     x = 240 : 20    x = 12 cm