Need help..

43.5 deg

How to get the answer? Thank u

if based on Bryan answer, that meant that OED is 60, OBE is 60 and BEO is 60. Thus DOC is 360-127-60-40=133. Then ODC and OCD is (180-133)/2 . OBC and OCB = (180-127)/2 , thus final answer is 180-23.5-26.5-26.5-60.

127/2 - 40/2 = 43.5 degrees

The explanation on why angle BAC = 127/2 - 40/2 = 43.5 degrees

Mine is a more complicated way. We have Angles CDO,DOC,OEB and OBE as 40 + 127 =167deg. 180×2-167/2= 276.5, 360-(276.5+40)=43.5

Good morning, Bryan. Don't worry, you are doing brilliantly at your age. Keep it up!

Morning! ;)

any.... simpler methods?

so many steps just for a 2 mark.... 😒

.....

Good morning Shu Hao. I did it in one. Perhaps you can do it in half?

as in include explanation.....

imagine writing one page of ans.... 😭😭😭😭

It's ok if it is short answer....

I included the explanation upon the request of one of the forum members who wanted to find out what was done. Shu Hao, can you come up with something to make it simplier?

its ok. have gotten it 😌

For some angle formulae, the inner angle sum = (n-2)×180, and outer angle sum is always 360 for any n-sided polygons.

so x is not isometric ? but i dun understand why (40+127)/2 to find x

2w + 2x will "top up" (BOE + COD) to 360 (sum of 2 triangles), as will (40 + 127) (angles at a point) That means they are equal.

Zhong Shu Hao, I'm not sure what level are you, but for GEP students, I just advise them to use 1 line... tada... no need to write long essays as they learn additional properties in Sec. .. ☺

Wow.....

Bcs I study in Malaysia. Maybe u have a better brain than me :/

Bryan, you are bright enough. Intelligence has nothing to do with nationality. :)

That is under circle properties. You will learn soon enough in secondary school, Bryan.

Interior and exterior angles, Bryan.

K. Thx

You are most welcome, Bryan. I do have to ask if you have the solution to one of the questions you posted a few days ago?

Umm.. which one?

The one asking for an angle in a triangle embedded in another triangle.

Oh. Solution written

Xavier Sng, why dont u try my latest questions posted. I got stuck

Haha Bryan, you need to take pity on an old man. I will have a look at them. Please, if you have the solution to that triangle problem, do let me know. I had flagged it.

Sorry. Mistake

Answer is 20 years old

How do you do it

10yrs ago Kim 1:4->. 4:16 Now Kim 3:7->. 9:21 Ratio is change to make the age difference between Kim and Cousin the same now and 10years ago. Change is 4u to 9u or 16u to 21u 5u=10 years u=2 years Now Kim is 9u= 18years old Two years time Kim will be 20years old(answer)

Thanks

7/10-(2/5×2/3)=13/30=312 Ans=312×(7/10)/(13/30)=504

thank u very much

Not at all

atFirst. End A->2p-p= p B->2u-u=u C->8u-0=8u atFirst-> 10u+2p= 840--eqn 1 End----->. 9u+p=620---eqn 2 eqn1 minus eqn 2 u+p=220-> p=220-u->eqn3 eqn3 into eqn 2 9u+p=620 9u+220-u=620 8u=400 2u=100-> Bernard had AtFirst Ans->100 sweets

thanks u very much

thank u very much

Not at all