Lines that intersect right angles (ninety-degree angles) are described as perpendicular.
Right angles
right angles where they cross
A parallelogram is a figure with different lengths and widths(also called breadth) where opposite sides and opposite angles are equal. But the angles are not 900 each. In fact, no angle in a parallelogram is a right angle as presence of 1 right angle proves all the angles to be right angles. A parallelogram with 4 right angles is called as a ''rectangle''
A rhombus.
Sand dunes that are at right angles to the wind are called Transverse Dunes. They form with weak winds and an abundant supply of sand.
Transverse dunes are long sand ridges that are oriented at right angles to the prevailing wind direction. They form when wind blows sand over a stationary object, like a plant or rock, causing the sand to accumulate into a ridge perpendicular to the wind direction.
They are at right angles because the spreading occurs at right angles to the ridges. If you look you will see that the faults happen at places where the ridges bend and they allow for the differential movement required.
A parallelogram with four right angles is typically called either a Rectangle or a Square.
They are called perpendicular lines that intersect each other at right angles.
A rhombus normally has no right angles (at the vertices). If a rhombus has right angles (at the vertices), it is called a square. The diagonals of a rhombus meet at right angles.
Lines that intersect right angles (ninety-degree angles) are described as perpendicular.
Right angles
The ridges in the anterior wall of the right atrium are called pectinate muscles or pectinate ridges. These muscular ridges are important for increasing the surface area of the atrium to allow for more efficient contraction and blood flow.
Complementary angles. Angles that add up to 180 are called supplementary angles. :)
Perpendicular lines intersect to form right angles
A quadrilateral having four right angles is called a rectangle.