? Answer the question below. Type your response in the space provided AB is perpendicular to CD. How many 90° angles are formed by the intersection? D​

there are 4 90 degree angles formed

4. Think of a lower t, there are 4 equal angles

Step-by-step explanation:

1/4 because there is 4 grades.

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for