Maths, Addmaths and Statistics: Post your doubts here!

[Lilly2318]

You're calculating the total area, they asked for the shaded area.
SHADED AREA. The one in grey-ish color.

You have to subtract the small sector area from big sector area.

yes iv done dat , i missed mentioning that ..but still the answer was diff...can u show the working .plz?

 

[Lilly2318]

yes iv done dat , i missed mentioning that ..but still the answer was diff...can u show the working .plz?

mayb then theres some prob in my calculation

 

[princess Anu]

can someone please provide me MATH marking scheme for paper 1 may june ?

 

[Dark Destination]

yes iv done dat , i missed mentioning that ..but still the answer was diff...can u show the working .plz?

9 pie/8 - 4 pie/8

= 5 pie/8

 

[princess Anu]

Q The height of a smaller glass is 8cm. The height of the larger glass is 10cm. the top of the largest glass has a circumference of 30cm. Find the circumference of the top of the smaller glass.
Answer is 4/5 please explain me the working.

 

[***amd***]

Q The height of a smaller glass is 8cm. The height of the larger glass is 10cm. the top of the largest glass has a circumference of 30cm. Find the circumference of the top of the smaller glass.
Answer is 4/5 please explain me the working.

are both the glass similar?

 

[Dark Destination]

Q The height of a smaller glass is 8cm. The height of the larger glass is 10cm. the top of the largest glass has a circumference of 30cm. Find the circumference of the top of the smaller glass.
Answer is 4/5 please explain me the working.

Inadequate information. You didn't quote the exact words of the question.

But keep one thing in mind.
Any two solids which are similar, have the same ratio of corresponding lengths.
Like if two cylinders are similar to each other, the ratio of their bottom circumferences will be equal to the ratio of their radius, and the ratio of their height.

But the ratio of their volume will be the cube of the ratio of their corresponding lengths.

 

[Zain Salman Dar]

If the probabilities that Jane, Tom, and Mary will be chosen chairperson of the board are 0.5, 0.3 and
0.2 respectively, what is the probability that the chairperson will be either Jane or Mary?
Please explain too.

And = multiply
Or = add

5/10+2/10= 7/10

 

[Zain Salman Dar]

4

Q The height of a smaller glass is 8cm. The height of the larger glass is 10cm. the top of the largest glass has a circumference of 30cm. Find the circumference of the top of the smaller glass.
Answer is 4/5 please explain me the working.

4/5 can never be possible. You are telling us the ratio of the height 8/10=4/5.
Through ratio method the answer is 24.
Through another method I applied the answer is 16.
One of the above answer is the solution you are looking for.

 

[Zain Salman Dar]

yes iv done dat , i missed mentioning that ..but still the answer was diff...can u show the working .plz?

area of total sector= 45/360 x pi x 3^2 = 9pi/8
area of unshaded region = 45/360 x pi x 2^2 = 4pi/8
area of shaded region= 9pi/8 - 4pi/8 = 5pi/8

 

[Lilly2318]

area of total sector= 45/360 x 2pi x 3^2 = 9pi/8
area of unshaded region = 45/360 x 2pi x 2^2 = 4pi/8
area of shaded region= 9pi/8 - 4pi/8 = 5pi/8

thnk u

 

[Lilly2318]

area of total sector= 45/360 x 2pi x 3^2 = 9pi/8
area of unshaded region = 45/360 x 2pi x 2^2 = 4pi/8
area of shaded region= 9pi/8 - 4pi/8 = 5pi/8

but y r u using 2pie. its the formula for circumfrnce , not area

 

[***amd***]

but y r u using 2pie. its the formula for circumfrnce , not area

yeah, he has mistaken i guess

 

[Zain Salman Dar]

but y r u using 2pie. its the formula for circumfrnce , not area

oh sorry for that. Did not notice :/

 

[princess Anu]

Yeah i think answer in book is wrong probably

 

[Maganius]

Can anyone please share with me notes on Angle Properties of Circles. Its way to difficult >.<
I can't even solve a single Q.
Anyone?

 

[asadalam]

Can anyone please share with me notes on Angle Properties of Circles. Its way to difficult >.<
I can't even solve a single Q.
Anyone?

You can read this pdf for some helpful tips,and on pg 11 you can find the tips on circles

 

[Maganius]

You can read this pdf for some helpful tips,and on pg 11 you can find the tips on circles

Thanks
btw have you got any detailed notes on this topic?
Although i know all the properties but still i'm not able to solve Qs of this topic (?_?)

 

[asadalam]

Thanks
btw have you got any detailed notes on this topic?
Although i know all the properties but still i'm not able to solve Qs of this topic (?_?)

Not really,but if you have any problem with any Q,you can ask anytime,and i'll tell you how to solve it

 

[Maganius]

Not really,but if you have any problem with any Q,you can ask anytime,and i'll tell you how to solve it

sure thing ^_^