a triangular shape that one part is 4cm and two part are equal to each other with the angel of 75 degree 75 degree and one 30 degree
can you tell me wath is the lengthof that two part
sory for bad english languige
thanks
2007-04-26 03:44:14 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
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2007-04-26 03:58:21 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Using the Law of sines:
75 degree/a = 30 degree/4cm => a = 10cm = b
Edit: Sorry forgot the sines. How embarrasing.
sin (75)/a = sin (30)/4 <=> a = sin(75)*4cm/sin(30) = 7,727
2007-04-26 10:52:21 · answer #2 · answered by idest23 2 · 0⤊ 0⤋
You may use the law of sines
sina/A=sinb/B=sinc/C
sin 75/x = sin 30/4
x= 4(sin 75)/ (sin 30)
x= 7.7274 cm for both unknown sides
2007-04-26 11:06:42 · answer #3 · answered by Robert L 7 · 0⤊ 0⤋
cos75=2/L
L= 2/cos 75
=7.727cm
2007-04-26 10:51:30 · answer #4 · answered by majid_727 2 · 0⤊ 0⤋