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Luas = luas bujur sangkar - luas 1/2 lingkaran= 28 x 28'- (1/2.phi.r^2)
= 784 - (1/2.22/7.14^2)
= 784 - ( 308 )
= 476 cm^2
keliling = 3x28 +(keliling 1/2 lingkaran)
= 84 + (1/2.2.22/7.14)
= 84 + 44
= 128 cm
mencari keliling lingkaran. (diameter=28cm, jari-jari=28/2=14cm)
K=2.22/7.r
=2.22/7.14
=88cm.
88cm/2=44cm. (dibagi 2 karena lingkarannya setengah)
mencari keliling persegi.
K=28+28+28
=84cm
Keliling = 88cm + 44cm = 128cm.
-----Luas yang diarsir-----
Luas setengah lingkaran=1/2.22/7.14²=1/2.22/7.196=308cm².
Luas persegi=28 x 28=784cm²
784cm² - 308cm² = 476cm².