25.05 in
Perimeter you just add all of the sides together.
Cos α = sin (90-α) so cos 19 = sin 90-19 = sin 71
CosA = 12/20 which is 3/5
Answer:
Option 2.
Step-by-step explanation:
4 x 2 1/2 x 3 1/2 = 35
Volume = 35
Answer:
Below in bold.
Step-by-step explanation:
The 2 triangles are congruent and they are both isosceles.
So m < 3 = 54 degrees. (isosceles triangle)
m < 2 = 54 degrees. (congruent triangles)
m < 1 = 180 - 2(54)
= 180 - 108
= 72 degrees. (angles in a triangle sum to 180).
m < 4 = 72 degrees. (congruent triangles),
