Determine the sin cos and tan of 3230118 to six places sin
Solution
9) we have given <A=28009\'29\'\',<C=49049\'59\'\' and length of c=1000ft
We know the formula sinA/a=sinB/b =sinC/c ---(1)
Converting angles A and C into degrees
<A= 28.158060,<C=49.83306°
From 1 we get
sinA/a=sinC/c
sin(28.158060)/a =sin(49.833060)/1000 since c=1000ft
by doing cross multiplication
a=[1000*sin(28.158060)]/sin(49.833060) =1000*(0.47)/(0.76)=618.4ft
Therefore
The length of side a for given triangle is 618.4ft
13) we have given length c=1000ft and <A=370,<B=870
From given triangle is <A+<B+<C=180 implies <C=180-37-87=560
By using formula sinA/a =sinB/b=sinC/c
sin(37)/a =sin(56)/1000 implies a=1000*(sin(37))/sin(56) =1000*(0.60)/(0.83) =722.9ft
a=722.9ft
sinB/b =sinC/c
sin(87)/b =sin(56)/1000 implies b=1000*sin(87)/sin(56)=1000*(0.99)/(0.83)=1192.7ft
Area of triangle is (1/2)*ab*sinC
(1/2)*ab*sinC =(1/2)*(722.9)*(1192.7)*sin(56)=(1/2)*(722.9)*(1192.7)(0.99)=426800 ft2
Therefore
the given tlriangle area is 426800 ft2
