Ịchọta ebe nke gburugburu: usoro na ihe atụ

gburugburu bụ ihe oyiyi geometric; set nke ihe na ụgbọ elu na-edina n'ime gburugburu.

Usoro mpaghara

okirikiri

Mpaghara nke okirikiri (S) nhata ngwaahịa nke ọnụọgụgụ π na square nke radius ya.

S = π⋅ r ²

Oghere okirikiri (r) bụ akụkụ ahịrị na-ejikọta etiti ya na isi ihe ọ bụla dị na gburugburu.

Cheta na: maka ịgbakọ uru nke ọnụọgụgụ π gbakọtara ruo 3,14.

Site dayameta

Mpaghara nke okirikiri bụ otu ụzọ n'ụzọ anọ nke ngwaahịa ahụ π na square nke dayameta ya:

Dayameta okirikiri (d) dị ka radii abụọ (d = 2r). Nke a bụ akụkụ ahịrị na-ejikọta isi ihe abụọ na-emegiderịta onwe ha na gburugburu.

Ihe atụ nke ọrụ

Ọrụ 1

Chọta ebe okirikiri nwere okirikiri nke 9 cm.

Mkpebi:

Anyị na-eji usoro nke radius gụnyere:

S = 3,14 ⋅ (9 cm)² = 254,34 sentimita².

Ọrụ 2

Chọta ebe okirikiri nwere dayameta nke 8 cm.

Mkpebi:

Anyị na-etinye usoro nke dayameta pụtara:

S = 1/4 ⋅ 3,14 ⋅ (8 cm)² = 50,24 sentimita².