Trzeba tu obliczyć obwód tego tójkąta
wysokosc h=10
kat przy C wiec wynosi 35° bo(180-(55+90)=35
kat przy B wynosi 20° bo (180-(90+70)=20
zatem:
sin35°=h/CB
0,5736=10/CB
CB=10:0,5736=17,43cm
sin70°=h/AB
0,9397=10/AB
AB=10; 0,9397=10,64cm
tg20°=x/h
0,364=x/10
x=3,64cm
tg55°=y/h
1,4281=y/10
y=14,281cm to bok AC =x+y=3,64+14,281=17,921cm
obwod Δ :
O=CB+AB+AC=17,43 +10,64+17,921 =45,991cm
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wysokosc h=10
kat przy C wiec wynosi 35° bo(180-(55+90)=35
kat przy B wynosi 20° bo (180-(90+70)=20
zatem:
sin35°=h/CB
0,5736=10/CB
CB=10:0,5736=17,43cm
sin70°=h/AB
0,9397=10/AB
AB=10; 0,9397=10,64cm
tg20°=x/h
0,364=x/10
x=3,64cm
tg55°=y/h
1,4281=y/10
y=14,281cm to bok AC =x+y=3,64+14,281=17,921cm
obwod Δ :
O=CB+AB+AC=17,43 +10,64+17,921 =45,991cm