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razor99
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|dw:1327404120182:dw|
razor99
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find the area of the trapezium
razor99
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i know the formulae but i dont know how to do
razor99
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here is the formulae
King
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what do i hav to find?
razor99
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|dw:1327404394659:dw|
razor99
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area
razor99
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plzzzzzzz help me
King
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area of the whole house is 31cm^2?
area of trapezium=16
area of rectangle =15
Diyadiya
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is that 7 cm?|dw:1327404717507:dw|
razor99
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yes it 7 cm
razor99
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this is a trapizium
razor99
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i dont know how to draw nicely.
King
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see razor,|dw:1327404780151:dw|
Diyadiya
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Okay
here a=3cm
b=5cm
h=7-3=4cm
Now Area= 1/2(a+b)h= 1/2* 8*4 =16 cm^2
razor99
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thank Diyadiya
King
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the whole house is a trapezium.....?
Diyadiya
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No
Its a rectangle + trapezium right ?
razor99
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yeah
razor99
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king is correct
King
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oh!
Diyadiya
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Question says to find the area of trapezium , not the whole house
razor99
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yeah but the anserw u gave was wrong
Diyadiya
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Oh wait then .. letme check again
King
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the house is the trapezium...
razor99
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okay the formulae says 1/2(a+b)h
King
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u need to giv us proper diagram....
razor99
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but didiya u have multiplied it
King
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if u hav a question can u post it?
Diyadiya
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\[\frac{1}{2} \times (5+3) \times 4= \frac{1}{2} \times 8 \times 4 =16\]
Diyadiya
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What is your final answer ?
razor99
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but in the back of the book its say the answer is its 31cm^2
Diyadiya
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Its the area of the whole house
thats area of rectangle + area of trapezium
lalaly
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yeah diya found the area of the trapezium which the top part =16cm^2
then u find the are a of the rectangle at the bottom, = 5*3 =15cm^2
then the area of the whole thing together is 16+15=31cm^2
mark_o.
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total At=area of rectangle + area of trapezoid
At= 3x5 + (1/2)(3+5)4
At= 15 + 32/2
At= 15 + 16 =31 square meter ans....
razor99
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ohh i get it know
razor99
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thanx for the help everyone.
King
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i gave u answr 31!