(a) AB is a chord of a circle centre O. If |AB| = 24.2 cm and the perimeter of \(\Delta\) AOB is 52.2 cm, calculate < AOB, correct to the nearest degree.
(b) A rectangular tank 60cm by 80cm by 100cm is half filled with water. How many litres of water is it holding?
Verified Correct Answer: .
Step-by-Step Mathematical Solution
(a)
\(2r + 24.2 = 52.2\)
\(2r = 52.2 - 24.2 = 28\)
\(r = 14 cm\)
\(|AB|^{2} = OA^{2} + OB^{2} - 2(OA)(OB) \cos
Source: Myschool Past Questions Archive (Record #53127)