Ninety (90)
1. It is the product of two consecutive integers. Such numbers are called Oblong numbers because it corresponds to the area of an oblong rectangle whose length is one greater than its width.
90 = 9 x 10
2. An angle of 90 degree is called a right angle.
3. Tangents touches the circle at 90 degree.
4. It is the sum of first 9 consecutive even numbers
. 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 = 90
5. It is the sum of two successive primes.
90 = 43 + 47
6. The interior angle of a square is 90 degree.
7. It is a Harshad number because it is divisible by sum of its digits.
8. The atomic number of Thorium is 90.
9. It is a 31 gonal number.
10. A truncated dodecahedron had 90 edges.
Dr Rajesh Kr Thakur
rkthakur1974@gmail.com
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