Find the length of a
on the triangle
A
B
C
if
∠
A
=
45
∘
,
b
=
25
,
c
=
12
.

Give an exact answer AND an approximate answer accurate to one decimal place. For your exact answer, leave your trig function but remove all other powers and products. You do not need to enter the degree symbol.

answer is 67%

step-by-step explanation:

54

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.