Slide 1

() ,, - - -

------- -,

---- --HEFGDCBAAPBO---

DCAB BAD CDA

ACB6ABC6h h

1 -

Hints: tan = AB/BC , = h/ , h = 8

h DBA C x (h-x) Hints: tan = BD/BC , / = / x , x= , sin = BD/CD , / = / (h-x) , h - x = , h - = h = +

(h-x)

; ? 6 1 -, , , AmyCEFBDOPnxQGJIHRKSUV ,

?13

1| GKwU wgbvii cv``k _K 20 wgUvi `~i f~Zji Kvb we`yZ wgbvii P~ovi DbwZ KvY 60 nj, wgbviwUi DPZv wbYq Ki|

gb Kwi, wgbviwUi kxlwe`y A , cv`we`y B Ges C we`yZ wgbvii P~ovi DbwZ KvY 60| BC = 20 wgUvi Ges ACB = 60 | A awi, wgbvii DPZv, AB = h wgUvi|GLb ABC G, tan 60 = ev, = h wgUvi ev, h = 20 ev, h = 34.6410 wgbviwUi DPZv 34.641 wgUvi (cvq) B 60 CAns: 34.641 wgUvi (cvq) 20 wgUvi

2| GKwU MvQ So Ggbfve fO Mj h Zvi fvOv Ask `vqgvb Aski mv_ 30 KvY Ki MvQi Mvov _K 10 wgUvi `~i gvU k Ki| MvQwUi m~Y `N KZ wQj?

gb Kwi, AB MvQwU f~wg _K x DPZvq C we`yZ f m~Y wewQb bv nq f~wgK D we`yZ k Ki|Zvnj, BD = 10 wgUvi, BC = x wgUvi Ges BCD = 30 | Aawi, MvQwUi `N, AB = h wgUvi AC = CD = (h x) wgUviGLb BCD G, tan 30 = ev, = h wg. C ev, x = 10 ------------------ (i) 30 Avevi, sin 30 = x wg. (h-x) wg. ev, = ev, h - x = 20 B 10 wg. D ev, h - 10 = 20 [(i) Gi mvnvh ]

ev, h = 20 + 10 ev, h = 37.3205

m~Y MvQi `N 37.321 wgUvi (cvq) Ans: 37.321 wgUvi (cvq)