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[acehkr3009]

Hi,


Here is a area of trangle question in MCQ...

Triangle ABC is an isosceles triangle with sides AB = 12cm AC = BC = 10cm.
Find the area of the triangle ABC?

Pls help...thks

Attached is a picture of the triangle.

http://postimage.org/image/tr6pyybo/

[Brenda10]

acehkr3009:

Hi,


Here is a area of trangle question in MCQ...

Triangle ABC is an isosceles triangle with sides AB = 12cm AC = BC = 10cm.
Find the area of the triangle ABC?

Pls help...thks

Attached is a picture of the triangle.

http://postimage.org/image/tr6pyybo/

Hi,

According to dd, the height is 5cm.

Area of 1/2 of the triangle : 1/2 x 5 x 10 = 25CM²
Total : 25CM² x 2 = 50CM²


Hope the answer is correct.

[YLH88]

Post deleted

[amberzbon]

Please help to solve these problems. thanks in advance

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Q1) Ali, Ben and Col each had a certain number of cards. Ali gave to Ben and Col some cards which is equal to the amount Ben and Col each originally had. Next, Ben gave to Ali an Col some cards which is equal to the amount Ali and Col each already had and finally Col gave to Ali and Ben in the similar manner. At the end, each had 32 cards each. Find the number of cards each had originally.


Q5) A box contains both pink and blue pens. 1/2 of the pink pens and 1/3 of the blue pens make up a total of 13 pens. 1/3 of the pink pens and 1/2 of the blue pens make up a total of 12 pens. How many pens are there of each colour?

[Dharma]

Brenda10:

acehkr3009:

Hi,


Here is a area of trangle question in MCQ...

Triangle ABC is an isosceles triangle with sides AB = 12cm AC = BC = 10cm.
Find the area of the triangle ABC?

Pls help...thks

Attached is a picture of the triangle.

http://postimage.org/image/tr6pyybo/

Hi,

According to dd, the height is 5cm.

Area of 1/2 of the triangle : 1/2 x 5 x 10 = 25CM²
Total : 25CM² x 2 = 50CM²


Hope the answer is correct.

Perpendicular height is 8cm

[YLH88]

Dharma:

Brenda10:

[quote=\"acehkr3009\"]Hi,


Here is a area of trangle question in MCQ...

Triangle ABC is an isosceles triangle with sides AB = 12cm AC = BC = 10cm.
Find the area of the triangle ABC?

Pls help...thks

Attached is a picture of the triangle.

http://postimage.org/image/tr6pyybo/

Hi,

According to dd, the height is 5cm.

Area of 1/2 of the triangle : 1/2 x 5 x 10 = 25CM²
Total : 25CM² x 2 = 50CM²


Hope the answer is correct.

Perpendicular height is 8cm[/quote]Hi Dharma,

How do you get the height = 8 cm ?

[Dharma]

YLH88:

acehkr3009:

Hi,


Here is a area of trangle question in MCQ...

Triangle ABC is an isosceles triangle with sides AB = 12cm AC = BC = 10cm.
Find the area of the triangle ABC?

Pls help...thks

Attached is a picture of the triangle.

http://postimage.org/image/tr6pyybo/

If you join 2 of the same isosceles triangles together, as shown in the diagram below, it will become a square.

http://postimage.org/image/uh05zzus/

area of the square = 10 x 10 = 100 cm2
area of the triangle ABC = 1/2 x 100 = 50 cm2

Hope the answer is correct.

Triangle ABC is not a right angle isoceles triangle . The 2 triangles put together as shown will not form a square.

[iFruit]

YLH88:

acehkr3009:

Hi,


Here is a area of trangle question in MCQ...

Triangle ABC is an isosceles triangle with sides AB = 12cm AC = BC = 10cm.
Find the area of the triangle ABC?

Pls help...thks

Attached is a picture of the triangle.

http://postimage.org/image/tr6pyybo/

If you join 2 of the same isosceles triangles together, as shown in the diagram below, it will become a square.

Not necessarily. It will become a rhombus but not necessarily a square.

The perpendicular line shown in the picture bisects AB. So in the right angle triangle, base = 6, hypotenuse = 10. So height = 8 (sqrt of 100-36)

So area of the triangle is 1/2 x 12 x 8 = 48 cm²

[Dharma]

YLH88:

Dharma:

[quote=\"Brenda10\"]
Hi,

According to dd, the height is 5cm.

Area of 1/2 of the triangle : 1/2 x 5 x 10 = 25CM²
Total : 25CM² x 2 = 50CM²


Hope the answer is correct.

Perpendicular height is 8cm

Hi Dharma,

How do you get the height = 8 cm ?[/quote]Pythagoras theorem but it is not primary maths stuff

[YLH88]

iFruit:

YLH88:

[quote=\"acehkr3009\"]Hi,


Here is a area of trangle question in MCQ...

Triangle ABC is an isosceles triangle with sides AB = 12cm AC = BC = 10cm.
Find the area of the triangle ABC?

Pls help...thks

Attached is a picture of the triangle.

http://postimage.org/image/tr6pyybo/

If you join 2 of the same isosceles triangles together, as shown in the diagram below, it will become a square.

Not necessarily. It will become a rhombus but not necessarily a square.

The perpendicular line shown in the picture bisects AB. So in the right angle triangle, base = 6, hypotenuse = 10. So height = 8 (sqrt of 100-36)

So area of the triangle is 1/2 x 12 x 8 = 48 cm²[/quote]Hi Dharma, iFruit,

Thanks for pointing out my mistake and I have already deleted my solution posted earlier. But the kids don't learn Pythagoras theorem in primary school ....

acehkr3009,
May I know the source of this question ? is it for primary level ?