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The right angle is symbolized by a small square, and its measure, 90°, is written to the right and above it. The angle placed to the right of the 90° angle is shown as an arc, and its measure, 30°, is written to the left of the arc. The angle above the right angle is also represented by an arc, and its measure, 60°, is written below said arc.
The 30°–60°–90° triangle is the only right triangle whose angles are in an arithmetic progression. The proof of this fact is simple and follows on from the fact that if α , α + δ , α + 2 δ are the angles in the progression then the sum of the angles 3 α + 3 δ = 180°.
Aesthetics (also spelled esthetics) is the branch of philosophy concerned with the nature of beauty and the nature of taste and, in a broad sense, incorporates the philosophy of art. [1]
Mid-century modern (MCM) is a movement in interior design, product design, graphic design, architecture and urban development that was present in all the world, but more popular in North America, Brazil and Europe from roughly 1945 to 1970 during the United States's post-World War II period.
The Greek question mark (Greek: ερωτηματικό, romanized: erōtīmatikó) looks like ;.It appeared around the same time as the Latin one, in the 8th century. [18]
In 1849, James B. Francis improved the inward flow reaction turbine to over 90% efficiency. He also conducted sophisticated tests and developed engineering methods for water turbine design. The Francis turbine, named for him, is the first modern water turbine. It is still the most widely used water turbine in the world today.
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