Find the perimeter of the figure at the right.

The perimeter of the figure is 82.275cm.

In order to find this, we must first find the length of the arc portion. For this we will use circumference of a circle formula and then cut the amount in half (since it is a semi circle). The formula is below:

2r = C

We know the radius is 9 since it is half of the 18 that is the full diameter.

2(9) = C

28.275 = C

Now we add that to the 3 other sides, which are all 18.

28.275 + 18 + 18 + 18 = 82.275

60

step-by-step explanation:

every triangle measures a total of 120 degrees. you have to find angle c. we know that isosceles triangles angles are equal. 60 degrees plus 60 degrees gives you 120.