What is the shape of the cross-section that will be formed by the plane if it passes through the vertex of the figure below?

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Lv beethoven software supplies customized software to a managed healthcare system. lv beethoven software's costs for the software is $1,723,000. lv beethoven software sells the software to the healthcare system for $3,816,981.10. overhead expenses are estimated at 47% of the selling price. what is lv beethoven software's net profit to the nearest dollar?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.