Resposta:
Lei dos cossenos
BD²= 48²+40²-2*48*40*cos(53)
BD²= 48²+40²-2*48*40*0,601815
BD²= 48^2+40^2-2*48*40*0,601815
BD²=1593,0304
BD=√1593,0304
BD=39,912
perímetro= 39,912+53+62 = 154,912 ~ 155
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Resposta:
Lei dos cossenos
BD²= 48²+40²-2*48*40*cos(53)
BD²= 48²+40²-2*48*40*0,601815
BD²= 48^2+40^2-2*48*40*0,601815
BD²=1593,0304
BD=√1593,0304
BD=39,912
perímetro= 39,912+53+62 = 154,912 ~ 155
Letra C