If c = 25 and 3 = 74º, find a round to the nearest tenth.

6.9

Step-by-step explanation:

Assuming that this is a right triangle trigonometry problem, we first need to determine what ratio must be used to find a.

B = 74°

c = 25

Sine equals Opposite over Hypotenuse.

Cosine equals Adjacent over Hypotenuse.

Tangent equals Opposite over Adjacent.

I'm guessing that c is the hypotenuse and that a is adjacent of B. With this, I know that we need to use cosine.

Cos∅ = (Adjacent ÷ Hypotenuse)

Cos∅ x Hypotenuse = Adjacent

Cos(74°) x 25 = a

(0.2756) x 25 = a

a = 6.89

Finally, round to the nearest tenth.

6.89 -> 6.9

~Hope this Helps!~

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk