Luas 1/2 lingkaran 157 cm. Hitunglah Panjang Diameter apabila π=3,14!

Luas 1/2 lingkaran

= 1/2 × π × r × r

= 157 cm

Panjang Diameter

= √ ( 157 cm2 ÷ 1/2 ) ÷ 3,14 × 2

= √ 314 ÷ 3,14 × 2

= √ 100 × 2

= 10 cm × 2

= 20 cm

Luas lingkaran = 1/2 × phi × r × r = 1/2 × 3,14 × 157 × 157 = 1/2 × 3,14 × 24.649 = 1/2 × 77.397,86 = 38.698,93 cm

Semoga Membantu :-)