The first one is rectangle
The building blocks of geometry would be point line and plane.
The formula for the sum of n terms in an arithmetic progression is:
S = n/2 * (2a + (n-1)d)
Here, the common difference, d, is 8 and the first term, a, is 1. Substituting these into the formula, we get:
S = n/2 * (2*1 + 8(n - 1))
S = n + 4n² - 4n
S = 4n² - 3n
The answer is A.
complementary angles sum up to 90°.
so if one of them is 43°, then the other is just 90 - 43 = 47°.
The axis of symmetry is x=2.
