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what is the perimeter
[#permalink]
05 May 2005, 00:14
05 May 2005, 00:14
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what is the perimeter?
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Re: what is the perimeter
[#permalink]
05 May 2005, 01:13
05 May 2005, 01:13
Area of the parallelogram = 1/2 x Base x Altitude.
From (1), 100 = 1/2 x 10 x Altitude. This gives altitude, but not the angle of the parallelogram. Thus the perimeter cant be determined.
From (2), One angle is 45 deg, the opposite is 45 too, and the two remainsin angles are 135 deg each. But this doesn't tell us the size of the sides to determine the parameter. Thus insufficient.
Combining,
We know the base and the altitude and the angles. (which angle is which doesn't matter). Thus the perimeter can be computed.
Hence C.
From (1), 100 = 1/2 x 10 x Altitude. This gives altitude, but not the angle of the parallelogram. Thus the perimeter cant be determined.
From (2), One angle is 45 deg, the opposite is 45 too, and the two remainsin angles are 135 deg each. But this doesn't tell us the size of the sides to determine the parameter. Thus insufficient.
Combining,
We know the base and the altitude and the angles. (which angle is which doesn't matter). Thus the perimeter can be computed.
Hence C.
Re: what is the perimeter
[#permalink]
05 May 2005, 05:32
05 May 2005, 05:32
kapslock,
Area = Base x Altitude (not 1/2)
from this, and given that base = height = 10, I couldn't get the exact dimensions for the perimeter...
Area = Base x Altitude (not 1/2)
from this, and given that base = height = 10, I couldn't get the exact dimensions for the perimeter...
thanks 
