How many grounds equals 1 acre?

Why are sun glasses with curved surfaces do not have any power? The first and fourth terms in a proportion are called? What is a convex octagon? How can the slope of a line be used to describe a line? How is perimeter used in real world? 3x4 inches is what in square feet? What is the name of a five sided polygon? What is the volume of water collected if the rainfall intensity is 10 millimetres in one hour duration with catchment area of 1 hectare roofing? What shape has a exterior angle of 45 degrees? What is the area of an irregular figure-sides 2cm 3cm 4cm and 9cm? What is midpoint postulate? What shape has three sides and all right angles? What is a shapeist? What are the Major axis and minor axis of rectangle? What are the two rays that form an angle? What does the axis of symmetry looks like? Does grey and red match? Closed geometric figure made up of three or more line segments? How many square feet in 6 inches by 24 inches? How do you Factoring perfect square of x2-14x plus 49?