1. Tentukan diameter lingkaran jika keliling lingkarannya 44 cm!
2. 80² + 20² – 100²
Nt:
Akhirnya bisa grade 4
QuiZ
Jwb :
1.
d = k ÷ π
= 44 ÷ 22/7
= 44 × 7/22
= 2 × 7
= 14 cm
2.
80² + 20² – 100²
= ( 80.80 ) + ( 20.20 ) – ( 100.100 )
= 6.400 + 400 – 10.000
= -3.200
– – – – – – –
2. 80² + 20² – 100² =
= (80 × 80) + (20 × 20) – (100 × 100)
= 6.400 + 400 – 10.000
= 6.800 – 10.000
= –3.200