Eisenmenger syndrome occurs when a congenital heart defect is not detected early enough to be treated before damage to the lung arteries occurs. If you or your child receives a diagnosis of a heart defect, it's important to start treatment promptly, including having surgeries or procedures to help correct the defect.
An acute angle is an angle with a measurement between 0Â° and 90Â°, or with less than 90Â° radians. It's the smallest of six different types of angles. There's an easy way to remember that an acute angle is small: think of it as a cute angle, perhaps visualizing a cute child playing an acute angle in a play about geometry.
In geometry and trigonometry, a right angle is an angle of exactly 90Â° (degrees),[1] corresponding to a quarter turn.[2] If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.[3] The term is a calque of Latin angulus rectus; here rectus means upright, referring to the vertical ...