Tutor MathsGuru: Ask me for your burning Maths questions!

[Daddy]

Dear MathsGuru,


Please help P5 math question.

1. The area of the rectangle ABCD below is 140 cm2.
Area of triangle XYD is 20 cm2.
Find the total shaded area of the rectangle.

http://i222.photobucket.com/albums/dd39/tham33/A.jpg\">

Daddy
Thanks all

[Maths Monster]

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[Maths Monster]

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[Maths Monster]

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[small]

Daddy:

Dear MathsGuru,


Please help P5 math question.

1. The area of the rectangle ABCD below is 140 cm2.
Area of triangle XYD is 20 cm2.
Find the total shaded area of the rectangle.

http://i222.photobucket.com/albums/dd39/tham33/A.jpg\">

Daddy
Thanks all

Hi daddy,

Please find the solution.

http://www.postimage.org/image.php?v=Tsg9A3i

[Dharma]

Daddy:

Dear MathsGuru,


Please help P5 math question.

1. The area of the rectangle ABCD below is 140 cm2.
Area of triangle XYD is 20 cm2.
Find the total shaded area of the rectangle.

http://i222.photobucket.com/albums/dd39/tham33/A.jpg\">

Daddy
Thanks all

Hi Daddy


The area of 3 shaded triangles + area of XYD = 1/2 of area of ABCD
Shaded area = (1/2 x 140cm2) - 20cm2 = 50cm2

[Maths Monster]

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[Daddy]

Hi Maths Monster,


Thanks alot.
[quote]
Dear maths guru,

Need help!!

Area of triangle problem.
1) The area of the triangle is 1/16 of the area of the rectangle. If the total area of the rectangle and triangle is 252 cm2. Find the perimeter of the rectangle.



Thanks[/quote]The answer is 60cm
This is what her's correction from teacher:

7U : 252 cm2
1U:252/7 = 36cm2
area of rectangle: 6x36cm2 = 216 cm2
L of the rectangle: 216 / 12 = 18 cm
perimeter of rectangle : 2(L+B) = 2(18+12)
= 60 cm.

But I do not know why 7U comes from...???

Thanks
Daddy :stupid:

[Maths Monster]

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[Maths Monster]

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