Answer:
The answer is 10+2√13
Step-by-step explanation:
First find the side of the angles, since its on a coordinate plane, you can simple count the units. From A to B it is 4 units, from B to C, it is 6 units.
Then with a²+b²=c², find the 3rd side from A to C
4²+6²=c²
16+36=c²
52=c²
√52=√c²
c= 2√13
Then, with perimeter, just simply add the sides
4+6+2√13= 10+2√13
since the 2 is being multiplied with the radical, it is not added with the other numbers, to the exact answer is 10+2√13
I hope this was correct and this helped you!
