Geometry/Pre-calc help!!!!?

Question

If θ is the smallest angle in a 3-4-5 right triangle, then sinθ=?

A. 3/5
B. 3/4
C. 4/5
D. 5/4
E. 5/3

Which of the following trigonometric ratios could NOT be π ?

A. tanθ
B. cosθ
C. cotθ
D. secθ
E. cscθ

Answer 1

A. 3/5

Answer 2

1. A.
sin(90) / 5 = sinθ / 3
1 / 5 = sinθ / 3
3 / 5 = sinθ

2. B
cosθ = y/x
π = y/x
π is irrational, so it must be either y or x. In this case, it must be y:
π = π/1; y=π, x=1
when x=1, the measure of π is 0. The cosine of angle 0 is 0, not π.

Answer 3

in the starting up you want to comprehend that an equilateral triangle is a triangle the position all 3 aspects have an similar length. Secondly you want to do not ignore that the formula for the area of a triangle is a million/2 x Base x height. because all aspects are equivalent, all angles of the triangle is 60 ranges. to discover the height you employ sin(60) = height/s. This simplifies to height = s x sin(60). section = a million/2 x Base x height section = a million/2 x s x s x sin(60) section = a million/2 x s^2 x sqrt(3)/2 {id of sin(60)} section = s^2 x sqrt(3)/4

Answer 4

3/5
B) cos theta

Answer 5

C

B

Answer 6

c,c