Question

YAN

求兩題

老師講解10
如圖,AB 爲直徑,AB =,
sine
=
3
求PA+PB之値
5
C
學生練習 10
(1)如圖,∠B=90°,且DE LAC.
B
設 AB=3,BC=2,求sin A =?
B
(2)若AD = 2,DE
AC = √2²+3² = √13
AX
√13
E
C