53 Voici la copie d'Akino : =
=
« AB2 = 3,642 AC2 + BC2 = 0,272 + 3,652
AB2 = 13,2496 AC2 + BC2 = 0,0729 + 13,3225
AC2 + BC2 = 13,3954
+
Donc AB2 AC2 + BC? Comme l'égalité de
Pythagore n'est pas vérifiée, alors ABC n'est pas
rectangle. »
Est-ce juste ? Justifie ta réponse et corrige cette
copie le cas échéant.

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.