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Area = 20*10 = 200 square units

Q: What is the area of a rectangle with one side 20 and the other x 10?

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yeah

A parallelogram is just a rectangle leaned to one side

Area: 15ab Perimeter: 2(3a+5b) or as 6a+10b

To find the area of a rectangle, you multiply the length by the width (one side by a different side) Or you could count how many centimeter squares make up the rectangle

The area of a rectangle equals its length times its width (A = l*w), so if you have the area divided by the one of the sides equals the other side (l = A/w; w = A/l )

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yeah

300 mm2

If the perimiter is 20 and one side is [[length]] then the other side is (10 - [[length]]). So the area is: [[length]] x (10 - [[length]]) square metres.

Divide the area by the known side.

Look at it this way, suppose x is one side of the rectangle and y is the other. Then the area of the rectangle would be xy. Now if you double each side of the originial rectangle you would have each side as 2x and 2y. So the area of the new rectangle would be 2x*2y or 4xy. As you can see the new area is 4 times larger than the original.

One side 8 long, other side 3 long.

A parallelogram is just a rectangle leaned to one side

3 3

Since the area of a rectangle is equal to the product of its two sides, then 4x - 3 is one factor of the product 12x^2 + 19x - 21 which represents the area. So the other factor is 3x + 7. Check: Or the given side could be 4x + 3 and the other side is 3x - 7, in order to obtain the area 12x^2 - 19x - 21.

Area = length x width. You have one of the sides; to get the other side, use the Pythagorean Theorem. Then multiply the two sides.

Area: 15ab Perimeter: 2(3a+5b) or as 6a+10b

To find the area of a rectangle, you multiply the length by the width (one side by a different side) Or you could count how many centimeter squares make up the rectangle