Answer:
AB=36
Step-by-step explanation:
BC=AC
AB=√(AC²+BC²)=√[(18√2)²+(18√2)²]=√(2×18²×2)=2×18=36
C = 2πr
141.3 = 2(3.14)r
141.3 = 6.28r
22.5 = r
Answer:
$12.49
Step-by-step explanation:
The price right now = 0.8 * the original price
9.99 = 0.8*x
x=12.4875
x≈12.49
Sorry, I thought your problem meant that it was 20% the original price, not 20% off.