Kupeza dera la bwalo: chilinganizo ndi zitsanzo

Circle ndi chithunzi cha geometric; mfundo pa ndege yomwe ili mkati mwa bwalo.

Area formula

utali wozungulira

Chigawo chozungulira (S) amafanana ndi chiwerengero π ndi bwalo la m'mbali mwake.

S = π ⋅ r ²

Mzere wozungulira (r) ndi gawo la mzere kulumikiza pakati ndi mfundo iliyonse pa bwalo.

Zindikirani: powerengera mtengo wa nambala π kuchuluka kwa 3,14.

Mwa diameter

Dera la bwalo ndi gawo limodzi mwa magawo anayi a chiwerengerocho π ndi lalikulu la m'mimba mwake;

Kuzungulira mozungulira (d) zikufanana ndi ma radii awiri (d = 2 ndi). Ichi ndi gawo la mzere womwe umalumikiza mfundo ziwiri zotsutsana pa bwalo.

Zitsanzo za ntchito

Ntchito 1

Pezani malo ozungulira omwe ali ndi ma radius 9 cm.

Kusankha:

Timagwiritsa ntchito njira yomwe radius ikukhudzidwa:

S = 3,14 ⋅ (9cm)² = 254,34 masentimita².

Ntchito 2

Pezani malo ozungulira omwe ali ndi mainchesi 8 cm.

Kusankha:

Timagwiritsa ntchito njira yomwe diameter ikuwonekera:

S = 1/4 ⋅ 3,14 ⋅ (8 cm)² = 50,24 masentimita².