Question

Tentukan keliling daerah yg di arsir..

Answer 1

Cara nya

1 ) Cari keliling 3/4 lingkaran
= 3/4 × 2 × phi × r
= 3/4 × 2 × 22/7 × 7 cm
= 3/4 × 44 cm
= 33 cm

2 ) Cari keliling 1/4 lingkaran
= 1/4 × 2 × phi × r
= 1/4 × 2 × 22/7 × 7 cm
= 1/4 × 44 cm
= 11 cm

3 ) Cari keliling yang di arsir
= 33 cm + ( 2 × ( 7 cm + 7 cm ) + 11 cm
= 33 cm + ( 2 × 14 cm ) + 11 cm )
= 33 cm + 28 cm + 11 cm
= 72 cm