###### Asked in Math and ArithmeticGeometry

Math and Arithmetic

Geometry

# What angles combine to equal 90 degrees?

## Answer

###### Wiki User

###### November 26, 2008 11:16AM

Angles combining to equal 90 degrees are known as complementary angles.

## Related Questions

###### Asked in Math and Arithmetic, Algebra, Geometry

### How much degrees are two right angles?

One right angle is equal to 90 degrees, or a vertical line
extending from the o degree plane. Therefore, two right angles,
presumably side to side, would have 180 degrees, since together the
would be supplementary angles. Supplementary angles are two angles
which combine to from 180 degrees, and 90 plus 90 would equal 180
degrees.
Look at angle DBE and at angle EBC. Each are 90 degree angles,
or right angles, and together equal 180 degrees.

###### Asked in Algebra

### Are all angles of a parallelogram equal to 90 degrees?

No, only in a square (regular parallelogram).
The opposite angles are EQUAL in a parallelogram, and the
adjacent angles are SUPPLEMENTARY
(they equal 180 degrees).
So if any angle in a parallelogram is a right angle, they all
are. Otherwise, there are no right angles.
The angles of a parallelogram will average 90 degrees, as
there are 360 degrees in any quadrilateral, (360/4 - 90) and 180
degrees in two adjacent non-equal angles (180/2 = 90).

###### Asked in Geology, Chemistry

### Crystals are classified into how many different crystals systems?

Seven. They are:
Cubic - all angles 90 degrees, all sides equal length
Trigonal - all angles 90 degrees, two sides equal and the third
unequal
Orthorhombic - all angles 90 degrees, no sides equal
Hexagonal - two angles 90 degrees and one angle 120 degrees, two
sides unequal and the third unequal
Trigonal - all angles equal but not 90, all sides equal
Monoclinic - two angles 90, one more than 90, and no sides
equal
Triclinic - no angles equal, no sides equal
For a graphical representation of these, see
http://en.wikipedia.org/wiki/Crystal_system#Classification_of_lattices

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