in the triangle OST OT=OS=4 units m∠OST = 60° cos 60°=(ST/2)/r-------> ST=2*r*cos 60°-----> 2*4*(1/2)----> 4 units so triangle OST <span>it's an equilateral triangle </span> the answer Part a) is ST=4 units
Part b) Find PT in the triangle POT m∠POT = (180°-60°)---------> 120° m∠OTP = 30° cos 30°=(PT/2)/r------> PT=2*r*cos 30°------> 2*4*√3/2----> 4√3 units
Sanitation Costs (per pound) Recycling $30 Landfilling $50 Burning $75 2,000 pounds = 1 ton/ $25 per ton / $25 per pound / $45 per ton / $45 per pound