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Firstly, if all the angles are not 90 degrees it isn't a rectangle - with 4 sides it is a quadrilateral. So there is no "if". Area of a rectangle = length of 1 side multiplied by the length of an adjacent (touching) side.

Q: What is the area of a rectangle if all the angles equal 90 degrees?

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A rectangle is, by definition, a parallelogram with four equal angles, all of which equal 90 degrees. If you only know three angles in a rectangle, something is wrong. In order to find the area of a rectangle, you must know its height and length. The area is then found by multiplying these two values together.

The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?

opposite sides are equal in length and parallel opposite angles are equal adjacent angles add up to 180 degrees no lines of symmetry base x vertical height = area sum of internal angles = 360 degrees sum of external angles = 360 degrees

The given vertices will form a rhombus when plotted on the Cartesian plane with 4 equal sides of 5 units with 2 equal opposite angles of 143.13 degrees and 2 equal opposite angles of 36.87 degrees including an area of 15 square units.

A parallelogram. A rectangle is a special case with all angles 90 degrees, but same area base times height

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A rectangle is, by definition, a parallelogram with four equal angles, all of which equal 90 degrees. If you only know three angles in a rectangle, something is wrong. In order to find the area of a rectangle, you must know its height and length. The area is then found by multiplying these two values together.

-- four sides -- four angles -- opposite sides are equal -- opposite sides are parallel -- opposite angles are equal -- adjacent angles are supplementary -- sum of interior angles is 360 degrees -- sum of exterior angles is 360 degrees -- area = (length of the base) x (height) -- can always be formed with two triangles -- diagonals bisect each other

The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?The answer depends on what aspect of a rectangle: its angles, area, side lengths, diagonals, other?

No. The area of a parallelogram varies infinitely from the maximum, as a rectangle, to virtually zero and the angles vary infinitely from 90 degrees to virtually zero or 180 degrees as the height of the parallelogram is reduced. There is no way to deduce the area of the parallelogram at any particular point in this transition by using the area of the rectangle alone.

opposite sides are equal in length and parallel opposite angles are equal adjacent angles add up to 180 degrees no lines of symmetry base x vertical height = area sum of internal angles = 360 degrees sum of external angles = 360 degrees

You can't - there is not enough information. The area also depends on the angles. For example, a rectangle of 6 x 4 has an area of 24 square units; if you change the angles, while keeping the sides, the area gets less, until - when two opposite angles are near zero, and the other two angles are near 180 degrees - the rectangle's area will be almost zero.

, sir,Every square is a rectangle, since the angles in the square are always right angles. However, every rectangle is NOT a square: a square is just a specific type of rectangle. Hope this helps! :-)

The given vertices will form a rhombus when plotted on the Cartesian plane with 4 equal sides of 5 units with 2 equal opposite angles of 143.13 degrees and 2 equal opposite angles of 36.87 degrees including an area of 15 square units.

A parallelogram. A rectangle is a special case with all angles 90 degrees, but same area base times height

Each side will be 6. Given only an area of 63, the shape will be a rectangle with four equal sides and each angle being 90 degrees.

The sum of the interior angles of any triangle always equals 180 degrees. With equal length sides, each angle will always be 60 degrees, irrespective of the length of the sides. Additionally, 1/2 B (base) x H (height) = A (area). If a line is drawn bisecting any interior angle to the nearest point on the opposite side (lateral), two right triangles will be produced. AND interestingly, when the two right triangles are placed next to each other along their hypotenuse, a rectangle is formed. Thus the formula for area of an equal lateral triangle can be shown to be the same as the formula for a rectangle when the length & width of the sides of the rectangle equal 1/2 the base and the height of the equal lateral triangle...QED

area of a square