Question

Need help with number 1,3,5 short questions shouldn’t be that hard.

Answer 1

Remember that

The formula to calculate the number of triangles formed by diagonals from one vertex is given by

n-2

where

n is the number of sides

so

Problem 1

14 gon

the value of n=14

14-2=12

therefore

The answer is 12 triangles

N 3

19 gon

n=19

19-2=17

The answer is 17 triangles

N 5

12 gon

n=12

12-2=10

The answer is 10 triangles