Answer:
5789 digits
Step-by-step explanation:
Given that the number of pages ares: 1,724
As we know that:
- (from 1 - 9) there are 9 one-digit numbers
- (from 10- 99) there are 90 two-digit numbers
- (from 100 - 999) there are 900 three-digit numbers
- (from 1,000 - 1,724) there are 725 four-digit numbers
So the total are:
![= 9(1)+90(2)+900(3)+725(4)\\\\= 9+180+2,700+2,900\\\\= 5,789\ digits](https://tex.z-dn.net/?f=%3D%209%281%29%2B90%282%29%2B900%283%29%2B725%284%29%5C%5C%5C%5C%3D%209%2B180%2B2%2C700%2B2%2C900%5C%5C%5C%5C%3D%205%2C789%5C%20digits)
1. Yes it is a right triangle.
1.25^2 = 1^2 + 0.75^2
1.5625 = 1 + 0.5625
1.5625 = 1.5625
Both sides are equivalent therefore it is a right triangle.
2. No it is not a right triangle.
28^2 = 21^2 + 20^2
782 = 441 + 400
782 does not equal 841 therefore it is not a right triangle.