21. Prove that:2cos3 A -cos Ach-What is the largest diametetotal surface area of the solid so formed, at the rate22. A cubical block of side 10 cm is surmounted by a hemislohemisphere can have ? Find the c5per100 sq. cm. Use π-314]ost of painting theORR I th perimeter of the following figure is 47 cm, find

21. Prove that:2cos3 A -cos Ach-What is the largest diametetotal surfa

1.	21. Prove that:2cos3 A -cos Ach-What is the largest diametetotal surface area of the solid so formed, at the rate22. A cubical block of side 10 cm is surmounted by a hemislohemisphere can have ? Find the c5per100 sq. cm. Use π-314]ost of painting theORR I th perimeter of the following figure is 47 cm, find
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