Answer:
Rachel is correct
Step-by-step explanation:
We can calculate angle T by using cosine rule where;
t² = r² + m² - 2rm cos T
From the diagram, we see that;
t = 30
r = 18
m = 24
Thus;
30² = 18² + 24² - 2(18 × 24)cosT
900 = 324 + 576 - 864cosT
864cosT = 900 - 324 - 576
864cosT = 0
cosT = 0/864
T = cos^(-1) 0
T = 90°
