Calculation formula of circumference

Perimeter = diameter x3.14

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14. Calculate (- 1) × (- 1) 2 × ((- 1) 3 × ×(-1)^99×(-1)^100
15. 1+2+3+4+5+6+7+8.+95+96+97+98+99+100
16. 1+2+3+4+5.+95+96+97+98+99＝?
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20. An isosceles triangle, the ratio of its vertex angle to its base angle is 1:4, and its base angle is ()?