[DSE數學] 常見3D Trigo 題，5*難度，一定要識。

[@KFungMath]

part a answer should be 62.3538，I made a careless mistake.

[@leochoo6559]

62.3538 is the area of ∆ACD, but the question in part (a) is asking for ∆BCD, so the answer in the video (104.096) should be correct

[@noooooo5521]

@@leochoo6559yes

[@theworldoffeast]

@@leochoo6559yes👍

[@kitchan0221]

係喎，由B奌打横睇垂直ACD嘅底所有側面都係90度，明晒啦!😀

[@justananonymous5237]

真係好愛你d片🤧 獲益良多 點解唔早d發現你d片😿

[@user-tttanxyy]

阿sir幾時返黎啊

[@kennyyu445]

會唔會有M2 topic 講

[@yutsummm5470]

2021 DSER thank you so much TT

[@anpanman6353]

請問會唔會出片

[@tszhochiu7520]

阿sir 2022 dse 生 睇緊你d片 努力中haha

[@cheungkaki]

請問是使用什麼iPad App? 我覺得呢個App做筆記好正。謝謝你

[@maikogaya4337]

多謝你吖

[@kk-xk9ex]

好有用！！多謝

[@kitchan0221]

AB丄ACD真係好難get到BAC同BAD都係直角，可否用其他3D角度分析此題，thx!

[@KFungMath]

sai ho chan 你試下喺張紙上畫幾條線，然後垂直枝筆棟喺上面，你就會睇到枝筆同紙上嘅線係直角

[@lipuiyin4103]

2024 DAE 👋🏻 超有用

[@kookiejeon879]

好清晰！！

[@Kris-ct6fl]

sry 阿sir我想問問你有​​無教duk機同sub數的影片？如果有可不可以tag條link haha​​,如果無吾知你可不可以教， paper 2常做不切實際，老師無教sub數哈哈

[@henrylaw87]

好好, 多謝你

[@Fidismsm]

AB垂直triangleACD的話，唔係CD let 一個點M mid point，拉條垂直線上去A，再連到B。angleBAM是90度，點解BAC BAD都係？

[@y2536524]

唔單只係angleBAM係90度, 當一條線(呢條數係AB)垂直一塊面(呢條數係ACD),咁個條線係會同塊面既任何線都成90度

[@patrickngai]

Should the area of triangle ACD be 62.3538?

[@KFungMath]

yes，抄錯咗....

[@stephenho3061]

可唔可以拍下M2 integration

[@PatPatYin]

Thanks 我最弱就係3d 希望數學攞到*啦

[@yeungNick]

然後發現今年3D幾乎冇學生做到

[@呂爆]

ACD面積唔係62.3538咩？

[@fung6066]

可唔可以講解下2017條3d

[@wayno2845]

你好 請問可唔可以講下離差向度？

[@virus6766]

阿sir咁勤力嘅

[@KFungMath]

😉

[@heidi1668]

hello 可唔可以講百分法

[@fantasy6578]

有貓聲！！

[@林辰星-n9y]

啊sir，点解都係英文版嘅?可唔可以拍些中文的

[@KFungMath]

我用廣東話講應該中英文嘅同學都聽得明？