Letter A
because we should add the two smaller number in the radical and if the sum equals to the other one. Then, it is a right triangle
Answer:
<h2>2.2</h2>
Step-by-step explanation:
Use the cosine law:

We have:

Substitute:

Answer:
10 in
Step-by-step explanation:
Old proportions:
2 x 3
New proportions
h x 15
Assuming the painting has been increased by a constant scale factor.
Where x is the unknown scale factor, and h is the height after it has been enlarged.

Rearrange second equation:

Substitute:
