Mathematics
Senior High
Resolved
請問進階題的第二題
AI: AD = 5:25 = 11:15. A1 = 41
2 如右圖,四邊形ABCD中,已知|AD|=|AB|=4,BD|=6,
ELAB+AD=DC.
17
(1)試說明∠BDC=90°,
20+2x=180° ° +x=9
(2)試求tan∠ADC.
(2)
3r
36
2X =
=
32
2×4-4
A
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