Congruent because you can map the triangles using a reflection across the y-axis which is a rigid motion
The rule of scientifinc notation is that we can use number between 0 and 10, so here we can use 2.8. Lets do this
280 000 000 = 2.8 * 100 * 1 000 000
Now we can just multiply 2.8 by 10 to the power of number of 0 reapeted
So

- its the result
The perimeter is 29! hope this helps
Rational is all real numbers. Irrational isnt
GE = 1/2 BG
GE = 1/2(24)
GE = 12
answer
12 mm