Question

a polygon with all angles equal has 20 sides.(a) What will be the measure of one of its outer angle? (b)What will be measure of one of its inner angle? ​

Answer 1

Answer:

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A polygon with 20 sides is called icosagon. It is indicated as 20-gon. A polygon with equal internal angles is referred to as regular polygon. A regular icosagon is indicated as {20}-gon. The sum of external angles of a polygon is equal to 360°.

Being a {20}-gon,

Each external angle = 360°/20 = 18°

Each internal angle = 180° – 18° = 162°; interior and external angles being supplementary.

Answer 2

Answer:

No. Of protons + No. of neutron = Mass no.

Step-by-step explanation:

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