To find the area of a circle find the radius and square it then multiply by PI
Area = PI x r^2
The Answer to your problem is:
0.8
Answer: triangle 1, triangle 2, and triangle 3
Step-by-step explanation:
Triangles 1 and 3 are congruent by SAS. So, by CPCTC, all three sides are congruent, making triangle 2 congruent to them as well by SSS.