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Volume of cylinder with a radius of 8cm and height of 25 cm

1. what is the measure of ∠abc? what is the measure of ∠abd?

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.