Question

w

想問問這題

GAT
如右圖,圓O為一單位圓,若AT=3
"
則:
4.
(1) PQ= 3
R
(2) QA =
P
0
310
QA
x
15
Ans : (1) 3 (2)

Answer 1

qn

AT / OA = tanθ = 3/4

PQ / OP = sinθ
QA = OA - OQ ，其中 OQ / OP = cosθ