When the sides are congruent (same direction and size), and the two opposite sides are parallel, the angles are the same. In an isosceles triangle, two angles are congruent, because two sides are congruent.
Answer:
180-88
92
Step-by-step explanation:
x=92
Answer:
50 miles
Step-by-step explanation:
This represents a 3-4-5 right triangle, where 3-4-5 is the ratio. Multiply those numbers by 10 to get 30-40-50. 30 and 40 are already in the problem, so 50 is the answer.
The first four terms of the series probably refer to the first four partial sums.




which you can compute either by adding one term at a time, or using the well-known formula,

(I can provide a link to a derivation I gave in a nearly identical question in the comments)
The series converges as

if and only if

, which is certainly the case here, since

.
Extrapolating from the formula above, the sum of the convergent series is

so the sum for this series is

.